40491290 has 32 divisors (see below), whose sum is σ = 84049920. Its totient is φ = 13757184.

The previous prime is 40491289. The next prime is 40491317. The reversal of 40491290 is 9219404.

40491290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5351 + ... + 10469.

It is an arithmetic number, because the mean of its divisors is an integer number (2626560).

Almost surely, 2^40491290 is an apocalyptic number.

40491290 is an abundant number, since it is smaller than the sum of its proper divisors (43558630).

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

40491290 is a wasteful number, since it uses less digits than its factorization.

40491290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 40491290 is about 6363.2766716527. The cubic root of 40491290 is about 343.3896525786.

The spelling of 40491290 in words is "forty million, four hundred ninety-one thousand, two hundred ninety".