400079 has 4 divisors (see below), whose sum is σ = 406920. Its totient is φ = 393240.

The previous prime is 400069. The next prime is 400087. The reversal of 400079 is 970004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400009) 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, 3332 + ... + 3449.

It is an arithmetic number, because the mean of its divisors is an integer number (101730).

2⁴⁰⁰⁰⁷⁹ is an apocalyptic number.

400079 is a deficient number, since it is larger than the sum of its proper divisors (6841).

400079 is an equidigital number, since it uses as much as digits as its factorization.

400079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 400079 is about 632.5179839341. The cubic root of 400079 is about 73.6854802950.

It can be divided in two parts, 40007 and 9, that multiplied together give a palindrome (360063).

The spelling of 400079 in words is "four hundred thousand, seventy-nine".