240157009 has 3 divisors (see below), whose sum is σ = 240172507. Its totient is φ = 240141512.

The previous prime is 240156971. The next prime is 240157019. The reversal of 240157009 is 900751042.

It is a happy number.

The square root of 240157009 is 15497.

It is a perfect power (a square), and thus also a powerful number.

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 can be written as a sum of positive squares in only one way, i.e., 232715025 + 7441984 = 15255^2 + 2728^2 .

It is a de Polignac number, because none of the positive numbers 2^k-240157009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240157019) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7749 + ... + 23245.

Almost surely, 2^240157009 is an apocalyptic number.

240157009 is the 15497-th square number.

240157009 is the 7749-th centered octagonal number.

It is an amenable number.

240157009 is a deficient number, since it is larger than the sum of its proper divisors (15498).

240157009 is an frugal number, since it uses more digits than its factorization.

240157009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30994 (or 15497 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The cubic root of 240157009 is about 621.5819892796.

The spelling of 240157009 in words is "two hundred forty million, one hundred fifty-seven thousand, nine".