400214391 has 16 divisors (see below), whose sum is σ = 565689600. Its totient is φ = 250812288.

The previous prime is 400214387. The next prime is 400214429. The reversal of 400214391 is 193412004.

It is not a de Polignac number, because 400214391 - 2² = 400214387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400214491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42600 + ... + 51138.

It is an arithmetic number, because the mean of its divisors is an integer number (35355600).

Almost surely, 2^400214391 is an apocalyptic number.

400214391 is the 12653-rd centered pentagonal number.

400214391 is a deficient number, since it is larger than the sum of its proper divisors (165475209).

400214391 is a wasteful number, since it uses less digits than its factorization.

400214391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9478.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 400214391 is about 20005.3590570127. The cubic root of 400214391 is about 736.9379134164.

Adding to 400214391 its reverse (193412004), we get a palindrome (593626395).

The spelling of 400214391 in words is "four hundred million, two hundred fourteen thousand, three hundred ninety-one".