400864279 has 2 divisors, whose sum is σ = 400864280. Its totient is φ = 400864278.

The previous prime is 400864273. The next prime is 400864291. The reversal of 400864279 is 972468004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400864279 - 2²⁵ = 367309847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400864273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200432139 + 200432140.

It is an arithmetic number, because the mean of its divisors is an integer number (200432140).

Almost surely, 2^400864279 is an apocalyptic number.

400864279 is a deficient number, since it is larger than the sum of its proper divisors (1).

400864279 is an equidigital number, since it uses as much as digits as its factorization.

400864279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 400864279 is about 20021.5953160581. The cubic root of 400864279 is about 737.3365898224.

The spelling of 400864279 in words is "four hundred million, eight hundred sixty-four thousand, two hundred seventy-nine".