19402157 has 2 divisors, whose sum is σ = 19402158. Its totient is φ = 19402156.

The previous prime is 19402139. The next prime is 19402177. The reversal of 19402157 is 75120491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 2910436 = 4061^2 + 1706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19402157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19402177) 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, 9701078 + 9701079.

It is an arithmetic number, because the mean of its divisors is an integer number (9701079).

Almost surely, 2^19402157 is an apocalyptic number.

It is an amenable number.

19402157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402157 is an equidigital number, since it uses as much as digits as its factorization.

19402157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 19402157 is about 4404.7879631147. The cubic root of 19402157 is about 268.7096963538.

The spelling of 19402157 in words is "nineteen million, four hundred two thousand, one hundred fifty-seven".