400007031 has 4 divisors (see below), whose sum is σ = 533342712. Its totient is φ = 266671352.

The previous prime is 400007021. The next prime is 400007071. The reversal of 400007031 is 130700004.

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 400007031 - 2¹³ = 399998839 is a prime.

It is a super-2 number, since 2×400007031² = 320011249698869922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400007031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400007021) 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, 66667836 + ... + 66667841.

It is an arithmetic number, because the mean of its divisors is an integer number (133335678).

Almost surely, 2^400007031 is an apocalyptic number.

400007031 is a deficient number, since it is larger than the sum of its proper divisors (133335681).

400007031 is a wasteful number, since it uses less digits than its factorization.

400007031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133335680.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 400007031 is about 20000.1757742276. The cubic root of 400007031 is about 736.8106167737.

Adding to 400007031 its reverse (130700004), we get a palindrome (530707035).

The spelling of 400007031 in words is "four hundred million, seven thousand, thirty-one".