40490640 has 60 divisors (see below), whose sum is σ = 135983484. Its totient is φ = 10797312.

The previous prime is 40490629. The next prime is 40490669. The reversal of 40490640 is 4609404.

It can be written as a sum of positive squares in 2 ways, for example, as 18249984 + 22240656 = 4272^2 + 4716^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27399 + ... + 28838.

Almost surely, 2^40490640 is an apocalyptic number.

40490640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40490640 is an abundant number, since it is smaller than the sum of its proper divisors (95492844).

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

40490640 is a wasteful number, since it uses less digits than its factorization.

40490640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56256 (or 56247 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40490640 is about 6363.2255971323. The cubic root of 40490640 is about 343.3878151096.

The spelling of 40490640 in words is "forty million, four hundred ninety thousand, six hundred forty".