1242666509 has 12 divisors (see below), whose sum is σ = 1453636800. Its totient is φ = 1059184728.

The previous prime is 1242666479. The next prime is 1242666521. The reversal of 1242666509 is 9056662421.

It is a happy number.

It is not a de Polignac number, because 1242666509 - 2¹⁶ = 1242600973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242663509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62069 + ... + 79610.

It is an arithmetic number, because the mean of its divisors is an integer number (121136400).

Almost surely, 2^1242666509 is an apocalyptic number.

It is an amenable number.

1242666509 is a deficient number, since it is larger than the sum of its proper divisors (210970291).

1242666509 is a wasteful number, since it uses less digits than its factorization.

1242666509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141872 (or 141865 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 1242666509 is about 35251.4752740931. The cubic root of 1242666509 is about 1075.1066082122.

The spelling of 1242666509 in words is "one billion, two hundred forty-two million, six hundred sixty-six thousand, five hundred nine".