400699807 has 2 divisors, whose sum is σ = 400699808. Its totient is φ = 400699806.

The previous prime is 400699781. The next prime is 400699811. The reversal of 400699807 is 708996004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400699807 - 2⁷ = 400699679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400699837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200349903 + 200349904.

It is an arithmetic number, because the mean of its divisors is an integer number (200349904).

Almost surely, 2^400699807 is an apocalyptic number.

400699807 is a deficient number, since it is larger than the sum of its proper divisors (1).

400699807 is an equidigital number, since it uses as much as digits as its factorization.

400699807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 400699807 is about 20017.4875296577. The cubic root of 400699807 is about 737.2357345626.

The spelling of 400699807 in words is "four hundred million, six hundred ninety-nine thousand, eight hundred seven".