400113031 has 4 divisors (see below), whose sum is σ = 400320064. Its totient is φ = 399906000.

The previous prime is 400113019. The next prime is 400113047. The reversal of 400113031 is 130311004.

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

It is a cyclic number.

It is not a de Polignac number, because 400113031 - 2⁹ = 400112519 is a prime.

It is a super-2 number, since 2×400113031² = 320180875152013922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400113331) 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, 100590 + ... + 104491.

It is an arithmetic number, because the mean of its divisors is an integer number (100080016).

Almost surely, 2^400113031 is an apocalyptic number.

400113031 is a deficient number, since it is larger than the sum of its proper divisors (207033).

400113031 is a wasteful number, since it uses less digits than its factorization.

400113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207032.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 400113031 is about 20002.8255754031. The cubic root of 400113031 is about 736.8756948194.

Adding to 400113031 its reverse (130311004), we get a palindrome (530424035).

The spelling of 400113031 in words is "four hundred million, one hundred thirteen thousand, thirty-one".