157240247 has 4 divisors (see below), whose sum is σ = 157265640. Its totient is φ = 157214856.

The previous prime is 157240229. The next prime is 157240253. The reversal of 157240247 is 742042751.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 157240247 - 2⁶ = 157240183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157240547) 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, 3368 + ... + 18050.

It is an arithmetic number, because the mean of its divisors is an integer number (39316410).

Almost surely, 2^157240247 is an apocalyptic number.

157240247 is a deficient number, since it is larger than the sum of its proper divisors (25393).

157240247 is a wasteful number, since it uses less digits than its factorization.

157240247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25392.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 157240247 is about 12539.5473203780. The cubic root of 157240247 is about 539.7441025760.

Adding to 157240247 its reverse (742042751), we get a palindrome (899282998).

The spelling of 157240247 in words is "one hundred fifty-seven million, two hundred forty thousand, two hundred forty-seven".