40621440 has 64 divisors (see below), whose sum is σ = 129486960. Its totient is φ = 10831872.

The previous prime is 40621433. The next prime is 40621463. The reversal of 40621440 is 4412604.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8659 + ... + 12498.

Almost surely, 2^40621440 is an apocalyptic number.

40621440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40621440 is an abundant number, since it is smaller than the sum of its proper divisors (88865520).

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

40621440 is a wasteful number, since it uses less digits than its factorization.

40621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21179 (or 21167 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 40621440 is about 6373.4951164961. The cubic root of 40621440 is about 343.7571749467.

The spelling of 40621440 in words is "forty million, six hundred twenty-one thousand, four hundred forty".