40450640 has 20 divisors (see below), whose sum is σ = 94047924. Its totient is φ = 16180224.

The previous prime is 40450637. The next prime is 40450651. The reversal of 40450640 is 4605404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17372224 + 23078416 = 4168^2 + 4804^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252737 + ... + 252896.

Almost surely, 2^40450640 is an apocalyptic number.

40450640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40450640 is an abundant number, since it is smaller than the sum of its proper divisors (53597284).

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

40450640 is a wasteful number, since it uses less digits than its factorization.

40450640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505646 (or 505640 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 40450640 is about 6360.0817604808. The cubic root of 40450640 is about 343.2747022345.

The spelling of 40450640 in words is "forty million, four hundred fifty thousand, six hundred forty".