1215606 has 32 divisors (see below), whose sum is σ = 2815488. Its totient is φ = 342720.

The previous prime is 1215587. The next prime is 1215623. The reversal of 1215606 is 6065121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 4186 + ... + 4466.

It is an arithmetic number, because the mean of its divisors is an integer number (87984).

2^1215606 is an apocalyptic number.

1215606 is an abundant number, since it is smaller than the sum of its proper divisors (1599882).

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

1215606 is a wasteful number, since it uses less digits than its factorization.

1215606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1215606 is about 1102.5452371672. The cubic root of 1215606 is about 106.7245367403.

The spelling of 1215606 in words is "one million, two hundred fifteen thousand, six hundred six".