157442993 has 8 divisors (see below), whose sum is σ = 161985096. Its totient is φ = 152934400.

The previous prime is 157442977. The next prime is 157443037. The reversal of 157442993 is 399244751.

It can be written as a sum of positive squares in 4 ways, for example, as 1517824 + 155925169 = 1232^2 + 12487^2 .

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 157442993 - 2⁴ = 157442977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157412993) 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 7 ways as a sum of consecutive naturals, for example, 1313 + ... + 17793.

It is an arithmetic number, because the mean of its divisors is an integer number (20248137).

Almost surely, 2^157442993 is an apocalyptic number.

It is an amenable number.

157442993 is a deficient number, since it is larger than the sum of its proper divisors (4542103).

157442993 is a wasteful number, since it uses less digits than its factorization.

157442993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16755.

The product of its digits is 272160, while the sum is 44.

The square root of 157442993 is about 12547.6289792136. The cubic root of 157442993 is about 539.9759854433.

The spelling of 157442993 in words is "one hundred fifty-seven million, four hundred forty-two thousand, nine hundred ninety-three".