31430140040 has 96 divisors (see below), whose sum is σ = 76659219720. Its totient is φ = 11592382464.

The previous prime is 31430140019. The next prime is 31430140087. The reversal of 31430140040 is 4004103413.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 7499906404 + 23930233636 = 86602^2 + 154694^2 .

It is a super-2 number, since 2×31430140040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31430139994 and 31430140021.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8197964 + ... + 8201796.

Almost surely, 2^31430140040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31430140040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38329609860).

31430140040 is an abundant number, since it is smaller than the sum of its proper divisors (45229079680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31430140040 is a wasteful number, since it uses less digits than its factorization.

31430140040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31430140040 its reverse (4004103413), we get a palindrome (35434243453).

The spelling of 31430140040 in words is "thirty-one billion, four hundred thirty million, one hundred forty thousand, forty".