40320400131 has 64 divisors (see below), whose sum is σ = 69160573440. Its totient is φ = 22944798720.

The previous prime is 40320400129. The next prime is 40320400157. The reversal of 40320400131 is 13100402304.

It is not a de Polignac number, because 40320400131 - 2¹ = 40320400129 is a prime.

It is a super-2 number, since 2×40320400131² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40320400331) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2176996 + ... + 2195438.

It is an arithmetic number, because the mean of its divisors is an integer number (1080633960).

Almost surely, 2^40320400131 is an apocalyptic number.

40320400131 is a deficient number, since it is larger than the sum of its proper divisors (28840173309).

40320400131 is a wasteful number, since it uses less digits than its factorization.

40320400131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18913 (or 18907 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 40320400131 its reverse (13100402304), we get a palindrome (53420802435).

The spelling of 40320400131 in words is "forty billion, three hundred twenty million, four hundred thousand, one hundred thirty-one".