400512311 has 4 divisors (see below), whose sum is σ = 400768824. Its totient is φ = 400255800.

The previous prime is 400512263. The next prime is 400512337. The reversal of 400512311 is 113215004.

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-400512311 is a prime.

It is a super-2 number, since 2×400512311² = 320820222525121442, which contains 22 as substring.

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 400512311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400512611) 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, 125900 + ... + 129041.

It is an arithmetic number, because the mean of its divisors is an integer number (100192206).

Almost surely, 2^400512311 is an apocalyptic number.

400512311 is a deficient number, since it is larger than the sum of its proper divisors (256513).

400512311 is a wasteful number, since it uses less digits than its factorization.

400512311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256512.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 400512311 is about 20012.8036766466. The cubic root of 400512311 is about 737.1207271726.

Adding to 400512311 its reverse (113215004), we get a palindrome (513727315).

The spelling of 400512311 in words is "four hundred million, five hundred twelve thousand, three hundred eleven".