40991312 has 40 divisors (see below), whose sum is σ = 81557280. Its totient is φ = 19952000.

The previous prime is 40991311. The next prime is 40991323. The reversal of 40991312 is 21319904.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40991311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163187 + ... + 163437.

It is an arithmetic number, because the mean of its divisors is an integer number (2038932).

Almost surely, 2^40991312 is an apocalyptic number.

It is an amenable number.

40991312 is a deficient number, since it is larger than the sum of its proper divisors (40565968).

40991312 is a wasteful number, since it uses less digits than its factorization.

40991312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 40991312 is about 6402.4457826677. The cubic root of 40991312 is about 344.7973661296.

The spelling of 40991312 in words is "forty million, nine hundred ninety-one thousand, three hundred twelve".