157730 has 8 divisors (see below), whose sum is σ = 283932. Its totient is φ = 63088.

The previous prime is 157721. The next prime is 157733. The reversal of 157730 is 37751.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 121 = 397^2 + 11^2 .

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

It is a Curzon number.

It is a plaindrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 157696 and 157705.

It is not an unprimeable number, because it can be changed into a prime (157733) by changing a digit.

157730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7877 + ... + 7896.

2¹⁵⁷⁷³⁰ is an apocalyptic number.

157730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157730 is a deficient number, since it is larger than the sum of its proper divisors (126202).

157730 is a wasteful number, since it uses less digits than its factorization.

157730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15780.

The product of its (nonzero) digits is 735, while the sum is 23.

The square root of 157730 is about 397.1523637094. The cubic root of 157730 is about 54.0303898443.

The spelling of 157730 in words is "one hundred fifty-seven thousand, seven hundred thirty".