157439999 has 8 divisors (see below), whose sum is σ = 159138528. Its totient is φ = 155750400.

The previous prime is 157439981. The next prime is 157440029. The reversal of 157439999 is 999934751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157439999 - 2⁸ = 157439743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157436999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36779 + ... + 40835.

It is an arithmetic number, because the mean of its divisors is an integer number (19892316).

Almost surely, 2^157439999 is an apocalyptic number.

157439999 is a deficient number, since it is larger than the sum of its proper divisors (1698529).

157439999 is a wasteful number, since it uses less digits than its factorization.

157439999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465.

The product of its digits is 2755620, while the sum is 56.

The square root of 157439999 is about 12547.5096732380. The cubic root of 157439999 is about 539.9725626206.

The spelling of 157439999 in words is "one hundred fifty-seven million, four hundred thirty-nine thousand, nine hundred ninety-nine".