400406394031 has 8 divisors (see below), whose sum is σ = 457766277120. Its totient is φ = 343086253368.

The previous prime is 400406394023. The next prime is 400406394053. The reversal of 400406394031 is 130493604004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400406394031 - 2³ = 400406394023 is a prime.

It is a super-2 number, since 2×400406394031² (a number of 24 digits) 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 (400406394631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9914011 + ... + 9954316.

It is an arithmetic number, because the mean of its divisors is an integer number (57220784640).

Almost surely, 2^400406394031 is an apocalyptic number.

400406394031 is a deficient number, since it is larger than the sum of its proper divisors (57359883089).

400406394031 is a wasteful number, since it uses less digits than its factorization.

400406394031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19871213.

The product of its (nonzero) digits is 31104, while the sum is 34.

Adding to 400406394031 its reverse (130493604004), we get a palindrome (530899998035).

The spelling of 400406394031 in words is "four hundred billion, four hundred six million, three hundred ninety-four thousand, thirty-one".