400621878719 has 16 divisors (see below), whose sum is σ = 420546168000. Its totient is φ = 380907369216.

The previous prime is 400621878707. The next prime is 400621878721. The reversal of 400621878719 is 917878126004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 400621878719 - 2⁸ = 400621878463 is a prime.

It is a super-2 number, since 2×400621878719² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400621878749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27642827 + ... + 27657315.

It is an arithmetic number, because the mean of its divisors is an integer number (26284135500).

Almost surely, 2^400621878719 is an apocalyptic number.

400621878719 is a deficient number, since it is larger than the sum of its proper divisors (19924289281).

400621878719 is a wasteful number, since it uses less digits than its factorization.

400621878719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21634.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 400621878719 in words is "four hundred billion, six hundred twenty-one million, eight hundred seventy-eight thousand, seven hundred nineteen".