1215536 has 20 divisors (see below), whose sum is σ = 2691792. Its totient is φ = 520896.

The previous prime is 1215521. The next prime is 1215553. The reversal of 1215536 is 6355121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5315 + ... + 5538.

2^1215536 is an apocalyptic number.

1215536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1215536 is an abundant number, since it is smaller than the sum of its proper divisors (1476256).

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

1215536 is a wasteful number, since it uses less digits than its factorization.

1215536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10868 (or 10862 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 1215536 is about 1102.5134919809. The cubic root of 1215536 is about 106.7224881432.

It can be divided in two parts, 12155 and 36, that multiplied together give a triangular number (437580 = T₉₃₅).

The spelling of 1215536 in words is "one million, two hundred fifteen thousand, five hundred thirty-six".