400621878707 has 2 divisors, whose sum is σ = 400621878708. Its totient is φ = 400621878706.

The previous prime is 400621878697. The next prime is 400621878721. The reversal of 400621878707 is 707878126004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400621878707 - 2¹⁴ = 400621862323 is a prime.

It is not a weakly prime, because it can be changed into another prime (400621878737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200310939353 + 200310939354.

It is an arithmetic number, because the mean of its divisors is an integer number (200310939354).

Almost surely, 2^400621878707 is an apocalyptic number.

400621878707 is a deficient number, since it is larger than the sum of its proper divisors (1).

400621878707 is an equidigital number, since it uses as much as digits as its factorization.

400621878707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 400621878707 in words is "four hundred billion, six hundred twenty-one million, eight hundred seventy-eight thousand, seven hundred seven".