157918909 has 8 divisors (see below), whose sum is σ = 159183360. Its totient is φ = 156660000.

The previous prime is 157918889. The next prime is 157918913. The reversal of 157918909 is 909819751.

It is a happy number.

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 157918909 - 2¹³ = 157910717 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 (157918979) 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, 69412 + ... + 71650.

It is an arithmetic number, because the mean of its divisors is an integer number (19897920).

Almost surely, 2^157918909 is an apocalyptic number.

It is an amenable number.

157918909 is a deficient number, since it is larger than the sum of its proper divisors (1264451).

157918909 is a wasteful number, since it uses less digits than its factorization.

157918909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 157918909 is about 12566.5790492083. The cubic root of 157918909 is about 540.5195148934.

The spelling of 157918909 in words is "one hundred fifty-seven million, nine hundred eighteen thousand, nine hundred nine".