1242979220 has 24 divisors (see below), whose sum is σ = 2983150464. Its totient is φ = 426164256.

The previous prime is 1242979139. The next prime is 1242979229. The reversal of 1242979220 is 229792421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242979229) 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, 4439072 + ... + 4439351.

It is an arithmetic number, because the mean of its divisors is an integer number (124297936).

Almost surely, 2^1242979220 is an apocalyptic number.

1242979220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242979220 is an abundant number, since it is smaller than the sum of its proper divisors (1740171244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242979220 is a wasteful number, since it uses less digits than its factorization.

1242979220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8878439 (or 8878437 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1242979220 is about 35255.9104264803. The cubic root of 1242979220 is about 1075.1967824365.

The spelling of 1242979220 in words is "one billion, two hundred forty-two million, nine hundred seventy-nine thousand, two hundred twenty".