31260040 has 96 divisors (see below), whose sum is σ = 84029400. Its totient is φ = 10429440.

The previous prime is 31260037. The next prime is 31260049. The reversal of 31260040 is 4006213.

31260040 = T₈₃ + T₈₄ + ... + T₅₇₂.

It can be written as a sum of positive squares in 4 ways, for example, as 12545764 + 18714276 = 3542^2 + 4326^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31259996 and 31260023.

It is not an unprimeable number, because it can be changed into a prime (31260049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80166 + ... + 80554.

Almost surely, 2^31260040 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 31260040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42014700).

31260040 is an abundant number, since it is smaller than the sum of its proper divisors (52769360).

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

31260040 is a wasteful number, since it uses less digits than its factorization.

31260040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31260040 is about 5591.0678765331. The cubic root of 31260040 is about 315.0139911481.

Adding to 31260040 its reverse (4006213), we get a palindrome (35266253).

The spelling of 31260040 in words is "thirty-one million, two hundred sixty thousand, forty".