4000399957 has 4 divisors (see below), whose sum is σ = 4000526496. Its totient is φ = 4000273420.

The previous prime is 4000399933. The next prime is 4000399969. The reversal of 4000399957 is 7599930004.

4000399957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4000399957 - 2¹¹ = 4000397909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000396957) 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, 29232 + ... + 94102.

It is an arithmetic number, because the mean of its divisors is an integer number (1000131624).

Almost surely, 2^4000399957 is an apocalyptic number.

It is an amenable number.

4000399957 is a deficient number, since it is larger than the sum of its proper divisors (126539).

4000399957 is an equidigital number, since it uses as much as digits as its factorization.

4000399957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126538.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 4000399957 is about 63248.7150620469. The cubic root of 4000399957 is about 1587.4539578851.

The spelling of 4000399957 in words is "four billion, three hundred ninety-nine thousand, nine hundred fifty-seven".