1215000972 has 48 divisors (see below), whose sum is σ = 3188914400. Its totient is φ = 404997408.

The previous prime is 1215000947. The next prime is 1215000979. The reversal of 1215000972 is 2790005121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1215000979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60697 + ... + 78192.

Almost surely, 2^1215000972 is an apocalyptic number.

1215000972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215000972 is an abundant number, since it is smaller than the sum of its proper divisors (1973913428).

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

1215000972 is an equidigital number, since it uses as much as digits as its factorization.

1215000972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138914 (or 138894 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 1215000972 is about 34856.8640586040. The cubic root of 1215000972 is about 1067.0682758984.

The spelling of 1215000972 in words is "one billion, two hundred fifteen million, nine hundred seventy-two", and thus it is an aban number.