400023111 has 4 divisors (see below), whose sum is σ = 533364152. Its totient is φ = 266682072.

The previous prime is 400023097. The next prime is 400023139. The reversal of 400023111 is 111320004.

It is a happy number.

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

It is not a de Polignac number, because 400023111 - 2⁵ = 400023079 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 (400023161) 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, 66670516 + ... + 66670521.

It is an arithmetic number, because the mean of its divisors is an integer number (133341038).

Almost surely, 2^400023111 is an apocalyptic number.

400023111 is a deficient number, since it is larger than the sum of its proper divisors (133341041).

400023111 is a wasteful number, since it uses less digits than its factorization.

400023111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133341040.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 400023111 is about 20000.5777666546. The cubic root of 400023111 is about 736.8204897301.

Adding to 400023111 its reverse (111320004), we get a palindrome (511343115).

The spelling of 400023111 in words is "four hundred million, twenty-three thousand, one hundred eleven".