31397652 has 192 divisors, whose sum is σ = 101606400. Its totient is φ = 8242560.

The previous prime is 31397651. The next prime is 31397659. The reversal of 31397652 is 25679313.

It is a super-2 number, since 2×31397652² = 1971625102226208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31397651) 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, 293383 + ... + 293489.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^31397652 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 31397652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50803200).

31397652 is an abundant number, since it is smaller than the sum of its proper divisors (70208748).

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

31397652 is a wasteful number, since it uses less digits than its factorization.

31397652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 155 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 31397652 is about 5603.3607772479. The cubic root of 31397652 is about 315.4755628495.

It can be divided in two parts, 313976 and 52, that added together give a triangular number (314028 = T₇₉₂).

The spelling of 31397652 in words is "thirty-one million, three hundred ninety-seven thousand, six hundred fifty-two".