405726959089 has 3 divisors (see below), whose sum is σ = 405727596057. Its totient is φ = 405726322122.

The previous prime is 405726959069. The next prime is 405726959107. The reversal of 405726959089 is 980959627504.

The square root of 405726959089 is 636967.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 405726959089 - 2⁷ = 405726958961 is a prime.

It is a super-2 number, since 2×405726959089² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405726959089.

It is not an unprimeable number, because it can be changed into a prime (405726959059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 318484 + ... + 955450.

It is an arithmetic number, because the mean of its divisors is an integer number (135242532019).

Almost surely, 2^405726959089 is an apocalyptic number.

405726959089 is the 636967-th square number.

405726959089 is the 318484-th centered octagonal number.

It is an amenable number.

405726959089 is a deficient number, since it is larger than the sum of its proper divisors (636968).

405726959089 is an frugal number, since it uses more digits than its factorization.

405726959089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273934 (or 636967 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 64.

Multiplying 405726959089 by its sum of digits (64), we get a square (25966525381696 = 5095736²).

The spelling of 405726959089 in words is "four hundred five billion, seven hundred twenty-six million, nine hundred fifty-nine thousand, eighty-nine".