400973939 has 4 divisors (see below), whose sum is σ = 404944080. Its totient is φ = 397003800.

The previous prime is 400973899. The next prime is 400973941. The reversal of 400973939 is 939379004.

It is a happy number.

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 400973939 - 2²⁰ = 399925363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400973939.

It is not an unprimeable number, because it can be changed into a prime (400973999) 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, 1984919 + ... + 1985120.

It is an arithmetic number, because the mean of its divisors is an integer number (101236020).

Almost surely, 2^400973939 is an apocalyptic number.

400973939 is a deficient number, since it is larger than the sum of its proper divisors (3970141).

400973939 is a wasteful number, since it uses less digits than its factorization.

400973939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970140.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 400973939 is about 20024.3336718104. Note that the first 3 decimals coincide. The cubic root of 400973939 is about 737.4038186933.

The spelling of 400973939 in words is "four hundred million, nine hundred seventy-three thousand, nine hundred thirty-nine".