157982391 has 24 divisors (see below), whose sum is σ = 262539264. Its totient is φ = 89672400.

The previous prime is 157982381. The next prime is 157982399. The reversal of 157982391 is 193289751.

It is not a de Polignac number, because 157982391 - 2¹⁴ = 157966007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157982399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1210 + ... + 17816.

It is an arithmetic number, because the mean of its divisors is an integer number (10939136).

Almost surely, 2^157982391 is an apocalyptic number.

157982391 is a deficient number, since it is larger than the sum of its proper divisors (104556873).

157982391 is a wasteful number, since it uses less digits than its factorization.

157982391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16771 (or 16768 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 157982391 is about 12569.1046220485. The cubic root of 157982391 is about 540.5919332065.

The spelling of 157982391 in words is "one hundred fifty-seven million, nine hundred eighty-two thousand, three hundred ninety-one".