157242909 has 8 divisors (see below), whose sum is σ = 209867040. Its totient is φ = 104723696.

The previous prime is 157242893. The next prime is 157242929. The reversal of 157242909 is 909242751.

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 157242909 - 2⁴ = 157242893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157242929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22662 + ... + 28775.

It is an arithmetic number, because the mean of its divisors is an integer number (26233380).

Almost surely, 2^157242909 is an apocalyptic number.

It is an amenable number.

157242909 is a deficient number, since it is larger than the sum of its proper divisors (52624131).

157242909 is a wasteful number, since it uses less digits than its factorization.

157242909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52459.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 157242909 is about 12539.6534641114. The cubic root of 157242909 is about 539.7471484262.

The spelling of 157242909 in words is "one hundred fifty-seven million, two hundred forty-two thousand, nine hundred nine".