157191730 has 16 divisors (see below), whose sum is σ = 283854744. Its totient is φ = 62674560.

The previous prime is 157191709. The next prime is 157191739. The reversal of 157191730 is 37191751.

157191730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 43705321 + 113486409 = 6611^2 + 10653^2 .

It is not an unprimeable number, because it can be changed into a prime (157191739) 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, 21981 + ... + 28240.

Almost surely, 2^157191730 is an apocalyptic number.

157191730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157191730 is a deficient number, since it is larger than the sum of its proper divisors (126663014).

157191730 is a wasteful number, since it uses less digits than its factorization.

157191730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50541.

The product of its (nonzero) digits is 6615, while the sum is 34.

The square root of 157191730 is about 12537.6126116578. The cubic root of 157191730 is about 539.6885835875.

The spelling of 157191730 in words is "one hundred fifty-seven million, one hundred ninety-one thousand, seven hundred thirty".