157973 has 4 divisors (see below), whose sum is σ = 161868. Its totient is φ = 154080.

The previous prime is 157951. The next prime is 157991. The reversal of 157973 is 379751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88804 + 69169 = 298^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 157973 - 2¹² = 153877 is a prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1886 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (40467).

2¹⁵⁷⁹⁷³ is an apocalyptic number.

It is an amenable number.

157973 is a deficient number, since it is larger than the sum of its proper divisors (3895).

157973 is an equidigital number, since it uses as much as digits as its factorization.

157973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894.

The product of its digits is 6615, while the sum is 32.

The square root of 157973 is about 397.4581739001. The cubic root of 157973 is about 54.0581221465.

The spelling of 157973 in words is "one hundred fifty-seven thousand, nine hundred seventy-three".