157706842 has 4 divisors (see below), whose sum is σ = 236560266. Its totient is φ = 78853420.

The previous prime is 157706803. The next prime is 157706849. The reversal of 157706842 is 248607751.

157706842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248607751 = 7 ⋅35515393.

It can be written as a sum of positive squares in only one way, i.e., 157477401 + 229441 = 12549^2 + 479^2 .

It is a super-2 number, since 2×157706842² = 49742896027225928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 157706795 and 157706804.

It is not an unprimeable number, because it can be changed into a prime (157706849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39426709 + ... + 39426712.

Almost surely, 2^157706842 is an apocalyptic number.

157706842 is a deficient number, since it is larger than the sum of its proper divisors (78853424).

157706842 is an equidigital number, since it uses as much as digits as its factorization.

157706842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78853423.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 157706842 is about 12558.1384767011. The cubic root of 157706842 is about 540.2774545832.

Subtracting 157706842 from its reverse (248607751), we obtain a palindrome (90900909).

The spelling of 157706842 in words is "one hundred fifty-seven million, seven hundred six thousand, eight hundred forty-two".