40640490 has 48 divisors (see below), whose sum is σ = 115274016. Its totient is φ = 9852000.

The previous prime is 40640447. The next prime is 40640497. The reversal of 40640490 is 9404604.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40640497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19536 + ... + 21515.

It is an arithmetic number, because the mean of its divisors is an integer number (2401542).

Almost surely, 2^40640490 is an apocalyptic number.

40640490 is an abundant number, since it is smaller than the sum of its proper divisors (74633526).

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

40640490 is a wasteful number, since it uses less digits than its factorization.

40640490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41075 (or 41072 counting only the distinct ones).

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

The square root of 40640490 is about 6374.9894117559. The cubic root of 40640490 is about 343.8109031484.

The spelling of 40640490 in words is "forty million, six hundred forty thousand, four hundred ninety".