39874561 has 2 divisors, whose sum is σ = 39874562. Its totient is φ = 39874560.

The previous prime is 39874529. The next prime is 39874579. The reversal of 39874561 is 16547893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35034561 + 4840000 = 5919^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 39874561 - 2⁵ = 39874529 is a prime.

It is a super-2 number, since 2×39874561² = 3179961229885442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39874511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19937280 + 19937281.

It is an arithmetic number, because the mean of its divisors is an integer number (19937281).

Almost surely, 2^39874561 is an apocalyptic number.

It is an amenable number.

39874561 is a deficient number, since it is larger than the sum of its proper divisors (1).

39874561 is an equidigital number, since it uses as much as digits as its factorization.

39874561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 39874561 is about 6314.6307097090. The cubic root of 39874561 is about 341.6373188620.

The spelling of 39874561 in words is "thirty-nine million, eight hundred seventy-four thousand, five hundred sixty-one".