31040136 has 48 divisors (see below), whose sum is σ = 85503600. Its totient is φ = 10169952.

The previous prime is 31040117. The next prime is 31040137. The reversal of 31040136 is 63104013.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31040137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 595 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (1781325).

Almost surely, 2^31040136 is an apocalyptic number.

31040136 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31040136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42751800).

31040136 is an abundant number, since it is smaller than the sum of its proper divisors (54463464).

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

31040136 is a wasteful number, since it uses less digits than its factorization.

31040136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378 (or 7371 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31040136 is about 5571.3675161490. The cubic root of 31040136 is about 314.2735793032.

Adding to 31040136 its reverse (63104013), we get a palindrome (94144149).

The spelling of 31040136 in words is "thirty-one million, forty thousand, one hundred thirty-six".