157790729 has 4 divisors (see below), whose sum is σ = 159788160. Its totient is φ = 155793300.

The previous prime is 157790671. The next prime is 157790749. The reversal of 157790729 is 927097751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157790729 - 2⁸ = 157790473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157790749) 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 in 3 ways as a sum of consecutive naturals, for example, 998597 + ... + 998754.

It is an arithmetic number, because the mean of its divisors is an integer number (39947040).

Almost surely, 2^157790729 is an apocalyptic number.

It is an amenable number.

157790729 is a deficient number, since it is larger than the sum of its proper divisors (1997431).

157790729 is an equidigital number, since it uses as much as digits as its factorization.

157790729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997430.

The product of its (nonzero) digits is 277830, while the sum is 47.

The square root of 157790729 is about 12561.4779783272. The cubic root of 157790729 is about 540.3732319143.

The spelling of 157790729 in words is "one hundred fifty-seven million, seven hundred ninety thousand, seven hundred twenty-nine".