157420789 has 2 divisors, whose sum is σ = 157420790. Its totient is φ = 157420788.

The previous prime is 157420751. The next prime is 157420793. The reversal of 157420789 is 987024751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157301764 + 119025 = 12542^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 157420789 - 2⁷ = 157420661 is a prime.

It is equal to p_8837944 and since 157420789 and 8837944 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157420709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78710394 + 78710395.

It is an arithmetic number, because the mean of its divisors is an integer number (78710395).

Almost surely, 2^157420789 is an apocalyptic number.

It is an amenable number.

157420789 is a deficient number, since it is larger than the sum of its proper divisors (1).

157420789 is an equidigital number, since it uses as much as digits as its factorization.

157420789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 157420789 is about 12546.7441593427. The cubic root of 157420789 is about 539.9506001906.

The spelling of 157420789 in words is "one hundred fifty-seven million, four hundred twenty thousand, seven hundred eighty-nine".