400044003997 has 4 divisors (see below), whose sum is σ = 436411640736. Its totient is φ = 363676367260.

The previous prime is 400044003971. The next prime is 400044004037. The reversal of 400044003997 is 799300440004.

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.

It is a cyclic number.

It is not a de Polignac number, because 400044003997 - 2³¹ = 397896520349 is a prime.

It is a super-4 number, since 4×400044003997⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400044003797) 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, 18183818353 + ... + 18183818374.

It is an arithmetic number, because the mean of its divisors is an integer number (109102910184).

Almost surely, 2^400044003997 is an apocalyptic number.

It is an amenable number.

400044003997 is a deficient number, since it is larger than the sum of its proper divisors (36367636739).

400044003997 is a wasteful number, since it uses less digits than its factorization.

400044003997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36367636738.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 400044003997 in words is "four hundred billion, forty-four million, three thousand, nine hundred ninety-seven".