406239257481 has 4 divisors (see below), whose sum is σ = 541652343312. Its totient is φ = 270826171652.

The previous prime is 406239257339. The next prime is 406239257513. The reversal of 406239257481 is 184752932604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 406239257481 - 2¹⁰ = 406239256457 is a prime.

It is a super-2 number, since 2×406239257481² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (406239257981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67706542911 + ... + 67706542916.

It is an arithmetic number, because the mean of its divisors is an integer number (135413085828).

It is a 1-persistent number, because it is pandigital, but 2⋅406239257481 = 812478514962 is not.

Almost surely, 2^406239257481 is an apocalyptic number.

It is an amenable number.

406239257481 is a deficient number, since it is larger than the sum of its proper divisors (135413085831).

406239257481 is a wasteful number, since it uses less digits than its factorization.

406239257481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135413085830.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 406239257481 in words is "four hundred six billion, two hundred thirty-nine million, two hundred fifty-seven thousand, four hundred eighty-one".