39974321 has 2 divisors, whose sum is σ = 39974322. Its totient is φ = 39974320.

The previous prime is 39974317. The next prime is 39974323. The reversal of 39974321 is 12347993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 2016400 = 6161^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 39974321 - 2² = 39974317 is a prime.

It is a super-2 number, since 2×39974321² = 3195892678822082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 39974323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39974323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19987160 + 19987161.

It is an arithmetic number, because the mean of its divisors is an integer number (19987161).

Almost surely, 2^39974321 is an apocalyptic number.

It is an amenable number.

39974321 is a deficient number, since it is larger than the sum of its proper divisors (1).

39974321 is an equidigital number, since it uses as much as digits as its factorization.

39974321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 39974321 is about 6322.5248912124. The cubic root of 39974321 is about 341.9219895484.

The spelling of 39974321 in words is "thirty-nine million, nine hundred seventy-four thousand, three hundred twenty-one".