40991616 has 128 divisors (see below), whose sum is σ = 125460000. Its totient is φ = 13160448.

The previous prime is 40991609. The next prime is 40991627. The reversal of 40991616 is 61619904.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 100020 + ... + 100428.

Almost surely, 2^40991616 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 40991616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62730000).

40991616 is an abundant number, since it is smaller than the sum of its proper divisors (84468384).

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

40991616 is a wasteful number, since it uses less digits than its factorization.

40991616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 40991616 is about 6402.4695235510. The cubic root of 40991616 is about 344.7982184902.

The spelling of 40991616 in words is "forty million, nine hundred ninety-one thousand, six hundred sixteen".