157689493 has 12 divisors (see below), whose sum is σ = 179233068. Its totient is φ = 137894400.

The previous prime is 157689491. The next prime is 157689503. The reversal of 157689493 is 394986751.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8898289 + 148791204 = 2983^2 + 12198^2 .

It is not a de Polignac number, because 157689493 - 2¹ = 157689491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157689493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157689491) 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 11 ways as a sum of consecutive naturals, for example, 12108 + ... + 21493.

It is an arithmetic number, because the mean of its divisors is an integer number (14936089).

Almost surely, 2^157689493 is an apocalyptic number.

157689493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

157689493 is a deficient number, since it is larger than the sum of its proper divisors (21543575).

157689493 is a wasteful number, since it uses less digits than its factorization.

157689493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33652 (or 33633 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 157689493 is about 12557.4477104227. The cubic root of 157689493 is about 540.2576422589.

The spelling of 157689493 in words is "one hundred fifty-seven million, six hundred eighty-nine thousand, four hundred ninety-three".