19942957 has 2 divisors, whose sum is σ = 19942958. Its totient is φ = 19942956.

The previous prime is 19942939. The next prime is 19942961. The reversal of 19942957 is 75924991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 42436 = 4461^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 19942957 - 2⁷ = 19942829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19942987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971478 + 9971479.

It is an arithmetic number, because the mean of its divisors is an integer number (9971479).

Almost surely, 2^19942957 is an apocalyptic number.

It is an amenable number.

19942957 is a deficient number, since it is larger than the sum of its proper divisors (1).

19942957 is an equidigital number, since it uses as much as digits as its factorization.

19942957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 46.

The square root of 19942957 is about 4465.7537997521. The cubic root of 19942957 is about 271.1834517172.

The spelling of 19942957 in words is "nineteen million, nine hundred forty-two thousand, nine hundred fifty-seven".