405956938 has 4 divisors (see below), whose sum is σ = 608935410. Its totient is φ = 202978468.

The previous prime is 405956927. The next prime is 405956951. The reversal of 405956938 is 839659504.

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

It can be written as a sum of positive squares in only one way, i.e., 325549849 + 80407089 = 18043^2 + 8967^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 405956891 and 405956900.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101489233 + ... + 101489236.

Almost surely, 2^405956938 is an apocalyptic number.

405956938 is a deficient number, since it is larger than the sum of its proper divisors (202978472).

405956938 is a wasteful number, since it uses less digits than its factorization.

405956938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202978471.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 405956938 is about 20148.3730856861. The cubic root of 405956938 is about 740.4458829739.

The spelling of 405956938 in words is "four hundred five million, nine hundred fifty-six thousand, nine hundred thirty-eight".