400123311 has 16 divisors (see below), whose sum is σ = 610898688. Its totient is φ = 228196800.

The previous prime is 400123307. The next prime is 400123331. The reversal of 400123311 is 113321004.

It is not a de Polignac number, because 400123311 - 2² = 400123307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400123331) 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, 7345 + ... + 29226.

It is an arithmetic number, because the mean of its divisors is an integer number (38181168).

Almost surely, 2^400123311 is an apocalyptic number.

400123311 is a deficient number, since it is larger than the sum of its proper divisors (210775377).

400123311 is a wasteful number, since it uses less digits than its factorization.

400123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37102.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 400123311 is about 20003.0825374491. The cubic root of 400123311 is about 736.8820055505.

Adding to 400123311 its reverse (113321004), we get a palindrome (513444315).

The spelling of 400123311 in words is "four hundred million, one hundred twenty-three thousand, three hundred eleven".