31197340 has 24 divisors (see below), whose sum is σ = 65740752. Its totient is φ = 12435840.

The previous prime is 31197319. The next prime is 31197349. The reversal of 31197340 is 4379113.

It is a junction number, because it is equal to n+sod(n) for n = 31197299 and 31197308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31197349) 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 7 ways as a sum of consecutive naturals, for example, 3600 + ... + 8680.

It is an arithmetic number, because the mean of its divisors is an integer number (2739198).

Almost surely, 2^31197340 is an apocalyptic number.

It is an amenable number.

31197340 is an abundant number, since it is smaller than the sum of its proper divisors (34543412).

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

31197340 is a wasteful number, since it uses less digits than its factorization.

31197340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397 (or 5395 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31197340 is about 5585.4579042367. The cubic root of 31197340 is about 314.8032364865.

The spelling of 31197340 in words is "thirty-one million, one hundred ninety-seven thousand, three hundred forty".