39700121 has 2 divisors, whose sum is σ = 39700122. Its totient is φ = 39700120.

The previous prime is 39700109. The next prime is 39700123. The reversal of 39700121 is 12100793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38576521 + 1123600 = 6211^2 + 1060^2 .

It is an emirp because it is prime and its reverse (12100793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39700121 is a prime.

Together with 39700123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39700123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19850060 + 19850061.

It is an arithmetic number, because the mean of its divisors is an integer number (19850061).

Almost surely, 2^39700121 is an apocalyptic number.

It is an amenable number.

39700121 is a deficient number, since it is larger than the sum of its proper divisors (1).

39700121 is an equidigital number, since it uses as much as digits as its factorization.

39700121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 39700121 is about 6300.8032027671. The cubic root of 39700121 is about 341.1384015210.

The spelling of 39700121 in words is "thirty-nine million, seven hundred thousand, one hundred twenty-one".