1242065279 has 24 divisors (see below), whose sum is σ = 1561156128. Its totient is φ = 979473600.

The previous prime is 1242065261. The next prime is 1242065281. The reversal of 1242065279 is 9725602421.

It is not a de Polignac number, because 1242065279 - 2²⁰ = 1241016703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242065179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198854 + ... + 205004.

It is an arithmetic number, because the mean of its divisors is an integer number (65048172).

Almost surely, 2^1242065279 is an apocalyptic number.

1242065279 is a deficient number, since it is larger than the sum of its proper divisors (319090849).

1242065279 is a wasteful number, since it uses less digits than its factorization.

1242065279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6495 (or 6488 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1242065279 is about 35242.9465141608. The cubic root of 1242065279 is about 1074.9331933244.

The spelling of 1242065279 in words is "one billion, two hundred forty-two million, sixty-five thousand, two hundred seventy-nine".