40392491 has 4 divisors (see below), whose sum is σ = 40995432. Its totient is φ = 39789552.

The previous prime is 40392481. The next prime is 40392509. The reversal of 40392491 is 19429304.

It is a happy number.

40392491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40392491 - 2¹⁰ = 40391467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40392481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 301370 + ... + 301503.

It is an arithmetic number, because the mean of its divisors is an integer number (10248858).

Almost surely, 2^40392491 is an apocalyptic number.

40392491 is a deficient number, since it is larger than the sum of its proper divisors (602941).

40392491 is an equidigital number, since it uses as much as digits as its factorization.

40392491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602940.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 40392491 is about 6355.5087129198. The cubic root of 40392491 is about 343.1101341487.

The spelling of 40392491 in words is "forty million, three hundred ninety-two thousand, four hundred ninety-one".