405925431 has 4 divisors (see below), whose sum is σ = 541233912. Its totient is φ = 270616952.

The previous prime is 405925427. The next prime is 405925451. The reversal of 405925431 is 134529504.

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 405925431 - 2² = 405925427 is a prime.

It is a super-2 number, since 2×405925431² = 329550911065071522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 405925392 and 405925401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405925411) 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, 67654236 + ... + 67654241.

It is an arithmetic number, because the mean of its divisors is an integer number (135308478).

Almost surely, 2^405925431 is an apocalyptic number.

405925431 is a deficient number, since it is larger than the sum of its proper divisors (135308481).

405925431 is a wasteful number, since it uses less digits than its factorization.

405925431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135308480.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 405925431 is about 20147.5911959718. The cubic root of 405925431 is about 740.4267267287.

The spelling of 405925431 in words is "four hundred five million, nine hundred twenty-five thousand, four hundred thirty-one".