157042747 has 4 divisors (see below), whose sum is σ = 157145040. Its totient is φ = 156940456.

The previous prime is 157042741. The next prime is 157042759. The reversal of 157042747 is 747240751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747240751 = 1213 ⋅616027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157042747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157042741) 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 3 ways as a sum of consecutive naturals, for example, 48808 + ... + 51925.

It is an arithmetic number, because the mean of its divisors is an integer number (39286260).

Almost surely, 2^157042747 is an apocalyptic number.

157042747 is a deficient number, since it is larger than the sum of its proper divisors (102293).

157042747 is a wasteful number, since it uses less digits than its factorization.

157042747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102292.

The product of its (nonzero) digits is 54880, while the sum is 37.

The square root of 157042747 is about 12531.6697610494. The cubic root of 157042747 is about 539.5180278814.

The spelling of 157042747 in words is "one hundred fifty-seven million, forty-two thousand, seven hundred forty-seven".