400279 has 4 divisors (see below), whose sum is σ = 436680. Its totient is φ = 363880.

The previous prime is 400277. The next prime is 400291. The reversal of 400279 is 972004.

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

It is not a de Polignac number, because 400279 - 2¹ = 400277 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 (400277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18184 + ... + 18205.

It is an arithmetic number, because the mean of its divisors is an integer number (109170).

2⁴⁰⁰²⁷⁹ is an apocalyptic number.

400279 is a deficient number, since it is larger than the sum of its proper divisors (36401).

400279 is a wasteful number, since it uses less digits than its factorization.

400279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36400.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 400279 is about 632.6760624522. The cubic root of 400279 is about 73.6977567379.

The spelling of 400279 in words is "four hundred thousand, two hundred seventy-nine".