400864799 has 2 divisors, whose sum is σ = 400864800. Its totient is φ = 400864798.

The previous prime is 400864781. The next prime is 400864801. The reversal of 400864799 is 997468004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400864799 - 2¹⁶ = 400799263 is a prime.

Together with 400864801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400824799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200432399 + 200432400.

It is an arithmetic number, because the mean of its divisors is an integer number (200432400).

Almost surely, 2^400864799 is an apocalyptic number.

400864799 is a deficient number, since it is larger than the sum of its proper divisors (1).

400864799 is an equidigital number, since it uses as much as digits as its factorization.

400864799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 400864799 is about 20021.6083020321. The cubic root of 400864799 is about 737.3369086459.

The spelling of 400864799 in words is "four hundred million, eight hundred sixty-four thousand, seven hundred ninety-nine".