405679389731 has 12 divisors (see below), whose sum is σ = 514813920120. Its totient is φ = 316113809760.

The previous prime is 405679389677. The next prime is 405679389749. The reversal of 405679389731 is 137983976504.

It is not a de Polignac number, because 405679389731 - 2¹⁸ = 405679127587 is a prime.

It is a super-2 number, since 2×405679389731² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405679389131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376325426 + ... + 376326503.

It is an arithmetic number, because the mean of its divisors is an integer number (42901160010).

Almost surely, 2^405679389731 is an apocalyptic number.

405679389731 is a deficient number, since it is larger than the sum of its proper divisors (109134530389).

405679389731 is a wasteful number, since it uses less digits than its factorization.

405679389731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752651954 (or 752651947 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 62.

The spelling of 405679389731 in words is "four hundred five billion, six hundred seventy-nine million, three hundred eighty-nine thousand, seven hundred thirty-one".