40412921 has 12 divisors (see below), whose sum is σ = 42902700. Its totient is φ = 38021760.

The previous prime is 40412891. The next prime is 40412923. The reversal of 40412921 is 12921404.

It can be written as a sum of positive squares in 6 ways, for example, as 9765625 + 30647296 = 3125^2 + 5536^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40412921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40412923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48335 + ... + 49163.

It is an arithmetic number, because the mean of its divisors is an integer number (3575225).

Almost surely, 2^40412921 is an apocalyptic number.

40412921 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40412921 is a deficient number, since it is larger than the sum of its proper divisors (2489779).

40412921 is an equidigital number, since it uses as much as digits as its factorization.

40412921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 40412921 is about 6357.1157768284. The cubic root of 40412921 is about 343.1679712894.

The spelling of 40412921 in words is "forty million, four hundred twelve thousand, nine hundred twenty-one".