400040279 has 4 divisors (see below), whose sum is σ = 405104160. Its totient is φ = 394976400.

The previous prime is 400040273. The next prime is 400040287. The reversal of 400040279 is 972040004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400040279 - 2⁸ = 400040023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531822 + ... + 2531979.

It is an arithmetic number, because the mean of its divisors is an integer number (101276040).

Almost surely, 2^400040279 is an apocalyptic number.

400040279 is a deficient number, since it is larger than the sum of its proper divisors (5063881).

400040279 is an equidigital number, since it uses as much as digits as its factorization.

400040279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5063880.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 400040279 is about 20001.0069496513. The cubic root of 400040279 is about 736.8310304154.

The spelling of 400040279 in words is "four hundred million, forty thousand, two hundred seventy-nine".