1215367980 has 48 divisors (see below), whose sum is σ = 3441281760. Its totient is φ = 320455168.

The previous prime is 1215367949. The next prime is 1215367991. The reversal of 1215367980 is 897635121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108459 + ... + 119138.

It is an arithmetic number, because the mean of its divisors is an integer number (71693370).

Almost surely, 2^1215367980 is an apocalyptic number.

1215367980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215367980 is an abundant number, since it is smaller than the sum of its proper divisors (2225913780).

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

1215367980 is a wasteful number, since it uses less digits than its factorization.

1215367980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227698 (or 227696 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1215367980 is about 34862.1281622336. The cubic root of 1215367980 is about 1067.1757060371.

The spelling of 1215367980 in words is "one billion, two hundred fifteen million, three hundred sixty-seven thousand, nine hundred eighty".