31397850 has 72 divisors (see below), whose sum is σ = 92038752. Its totient is φ = 7610400.

The previous prime is 31397843. The next prime is 31397851. The reversal of 31397850 is 5879313.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31397851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1779 + ... + 8121.

It is an arithmetic number, because the mean of its divisors is an integer number (1278316).

Almost surely, 2^31397850 is an apocalyptic number.

31397850 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31397850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46019376).

31397850 is an abundant number, since it is smaller than the sum of its proper divisors (60640902).

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

31397850 is a wasteful number, since it uses less digits than its factorization.

31397850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6372 (or 6364 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 31397850 is about 5603.3784451882. The cubic root of 31397850 is about 315.4762259992.

It can be divided in two parts, 313978 and 50, that added together give a triangular number (314028 = T₇₉₂).

The spelling of 31397850 in words is "thirty-one million, three hundred ninety-seven thousand, eight hundred fifty".