157397987 has 2 divisors, whose sum is σ = 157397988. Its totient is φ = 157397986.

The previous prime is 157397959. The next prime is 157398011. The reversal of 157397987 is 789793751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157397987 - 2¹⁴ = 157381603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157397687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78698993 + 78698994.

It is an arithmetic number, because the mean of its divisors is an integer number (78698994).

Almost surely, 2^157397987 is an apocalyptic number.

157397987 is a deficient number, since it is larger than the sum of its proper divisors (1).

157397987 is an equidigital number, since it uses as much as digits as its factorization.

157397987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3333960, while the sum is 56.

The square root of 157397987 is about 12545.8354444812. The cubic root of 157397987 is about 539.9245287758.

The spelling of 157397987 in words is "one hundred fifty-seven million, three hundred ninety-seven thousand, nine hundred eighty-seven".