1898395157 has 2 divisors, whose sum is σ = 1898395158. Its totient is φ = 1898395156.

The previous prime is 1898395133. The next prime is 1898395159. The reversal of 1898395157 is 7515938981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1680508036 + 217887121 = 40994^2 + 14761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898395157 - 2²⁶ = 1831286293 is a prime.

Together with 1898395159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898395159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949197578 + 949197579.

It is an arithmetic number, because the mean of its divisors is an integer number (949197579).

Almost surely, 2^1898395157 is an apocalyptic number.

It is an amenable number.

1898395157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898395157 is an equidigital number, since it uses as much as digits as its factorization.

1898395157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 56.

The square root of 1898395157 is about 43570.5767347645. The cubic root of 1898395157 is about 1238.2135124395.

The spelling of 1898395157 in words is "one billion, eight hundred ninety-eight million, three hundred ninety-five thousand, one hundred fifty-seven".