399904053 has 4 divisors (see below), whose sum is σ = 533205408. Its totient is φ = 266602700.

The previous prime is 399904051. The next prime is 399904081. The reversal of 399904053 is 350409993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 350409993 = 3 ⋅116803331.

It is a cyclic number.

It is not a de Polignac number, because 399904053 - 2¹ = 399904051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399903996 and 399904014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399904051) 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, 66650673 + ... + 66650678.

It is an arithmetic number, because the mean of its divisors is an integer number (133301352).

Almost surely, 2^399904053 is an apocalyptic number.

It is an amenable number.

399904053 is a deficient number, since it is larger than the sum of its proper divisors (133301355).

399904053 is a wasteful number, since it uses less digits than its factorization.

399904053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133301354.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 399904053 is about 19997.6011811417. The cubic root of 399904053 is about 736.7473830554.

The spelling of 399904053 in words is "three hundred ninety-nine million, nine hundred four thousand, fifty-three".