40124921 has 2 divisors, whose sum is σ = 40124922. Its totient is φ = 40124920.

The previous prime is 40124899. The next prime is 40124957. The reversal of 40124921 is 12942104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27415696 + 12709225 = 5236^2 + 3565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40124921 is a prime.

It is a super-2 number, since 2×40124921² = 3220018570512482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40124221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20062460 + 20062461.

It is an arithmetic number, because the mean of its divisors is an integer number (20062461).

Almost surely, 2^40124921 is an apocalyptic number.

It is an amenable number.

40124921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40124921 is an equidigital number, since it uses as much as digits as its factorization.

40124921 is an evil number, because the sum of its binary digits is even.

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

The square root of 40124921 is about 6334.4234938943. The cubic root of 40124921 is about 342.3508391995.

The spelling of 40124921 in words is "forty million, one hundred twenty-four thousand, nine hundred twenty-one".