405689937139 has 4 divisors (see below), whose sum is σ = 405729209056. Its totient is φ = 405650665224.

The previous prime is 405689937131. The next prime is 405689937179. The reversal of 405689937139 is 931739986504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405689937139 - 2³ = 405689937131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405689937131) 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, 19620459 + ... + 19641124.

It is an arithmetic number, because the mean of its divisors is an integer number (101432302264).

Almost surely, 2^405689937139 is an apocalyptic number.

405689937139 is a deficient number, since it is larger than the sum of its proper divisors (39271917).

405689937139 is a wasteful number, since it uses less digits than its factorization.

405689937139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39271916.

The product of its (nonzero) digits is 44089920, while the sum is 64.

The spelling of 405689937139 in words is "four hundred five billion, six hundred eighty-nine million, nine hundred thirty-seven thousand, one hundred thirty-nine".