31749894 has 48 divisors (see below), whose sum is σ = 77837760. Its totient is φ = 9619560.

The previous prime is 31749889. The next prime is 31749901. The reversal of 31749894 is 49894713.

It is a super-2 number, since 2×31749894² = 2016111538022472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2377 + ... + 8315.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^31749894 is an apocalyptic number.

31749894 is the 3564-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31749894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38918880).

31749894 is an abundant number, since it is smaller than the sum of its proper divisors (46087866).

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

31749894 is a wasteful number, since it uses less digits than its factorization.

31749894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5967 (or 5955 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31749894 is about 5634.7044288055. The cubic root of 31749894 is about 316.6509241789.

The spelling of 31749894 in words is "thirty-one million, seven hundred forty-nine thousand, eight hundred ninety-four".