31380036 has 24 divisors (see below), whose sum is σ = 73342080. Its totient is φ = 10442592.

The previous prime is 31380031. The next prime is 31380101. The reversal of 31380036 is 63008313.

It is a super-2 number, since 2×31380036² = 1969413318722592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31379988 and 31380015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6810 + ... + 10446.

It is an arithmetic number, because the mean of its divisors is an integer number (3055920).

Almost surely, 2^31380036 is an apocalyptic number.

It is an amenable number.

31380036 is an abundant number, since it is smaller than the sum of its proper divisors (41962044).

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

31380036 is a wasteful number, since it uses less digits than its factorization.

31380036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363 (or 4361 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31380036 is about 5601.7886429247. The cubic root of 31380036 is about 315.4165514603.

Adding to 31380036 its reverse (63008313), we get a palindrome (94388349).

The spelling of 31380036 in words is "thirty-one million, three hundred eighty thousand, thirty-six".