1215972 has 48 divisors (see below), whose sum is σ = 3214400. Its totient is φ = 402408.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215972 is 2795121.

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

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, 8679 + ... + 8817.

2^1215972 is an apocalyptic number.

1215972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607200).

1215972 is an abundant number, since it is smaller than the sum of its proper divisors (1998428).

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

1215972 is an equidigital number, since it uses as much as digits as its factorization.

1215972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 144 counting only the distinct ones).

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

The square root of 1215972 is about 1102.7112042598. The cubic root of 1215972 is about 106.7352466965.

It can be divided in two parts, 1215 and 972, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1215972 in words is "one million, two hundred fifteen thousand, nine hundred seventy-two".