40984921 has 2 divisors, whose sum is σ = 40984922. Its totient is φ = 40984920.

The previous prime is 40984913. The next prime is 40984949. The reversal of 40984921 is 12948904.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23386896 + 17598025 = 4836^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 40984921 - 2³ = 40984913 is a prime.

It is not a weakly prime, because it can be changed into another prime (40984961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20492460 + 20492461.

It is an arithmetic number, because the mean of its divisors is an integer number (20492461).

Almost surely, 2^40984921 is an apocalyptic number.

It is an amenable number.

40984921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40984921 is an equidigital number, since it uses as much as digits as its factorization.

40984921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 40984921 is about 6401.9466570724. The cubic root of 40984921 is about 344.7794459542.

It can be divided in two parts, 40984 and 921, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 40984921 in words is "forty million, nine hundred eighty-four thousand, nine hundred twenty-one".