31149440 has 128 divisors (see below), whose sum is σ = 90331200. Its totient is φ = 10027008.

The previous prime is 31149431. The next prime is 31149473. The reversal of 31149440 is 4494113.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×31149440² = 1940575224627200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75956 + ... + 76364.

Almost surely, 2^31149440 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 31149440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45165600).

31149440 is an abundant number, since it is smaller than the sum of its proper divisors (59181760).

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

31149440 is a wasteful number, since it uses less digits than its factorization.

31149440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 31149440 is about 5581.1683364686. The cubic root of 31149440 is about 314.6420389931.

The spelling of 31149440 in words is "thirty-one million, one hundred forty-nine thousand, four hundred forty".