40491520 has 40 divisors (see below), whose sum is σ = 97090884. Its totient is φ = 16195584.

The previous prime is 40491499. The next prime is 40491541. The reversal of 40491520 is 2519404.

It is an interprime number because it is at equal distance from previous prime (40491499) and next prime (40491541).

It can be written as a sum of positive squares in 2 ways, for example, as 39538944 + 952576 = 6288^2 + 976^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5349 + ... + 10468.

Almost surely, 2^40491520 is an apocalyptic number.

40491520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40491520 is an abundant number, since it is smaller than the sum of its proper divisors (56599364).

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

40491520 is an equidigital number, since it uses as much as digits as its factorization.

40491520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15840 (or 15824 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 40491520 is about 6363.2947440772. The cubic root of 40491520 is about 343.3903027552.

It can be divided in two parts, 404915 and 20, that multiplied together give a triangular number (8098300 = T₄₀₂₄).

The spelling of 40491520 in words is "forty million, four hundred ninety-one thousand, five hundred twenty".