1215388 has 12 divisors (see below), whose sum is σ = 2135952. Its totient is φ = 605120.

The previous prime is 1215367. The next prime is 1215391. The reversal of 1215388 is 8835121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 756 + ... + 1732.

It is an arithmetic number, because the mean of its divisors is an integer number (177996).

2^1215388 is an apocalyptic number.

It is an amenable number.

1215388 is a deficient number, since it is larger than the sum of its proper divisors (920564).

1215388 is a wasteful number, since it uses less digits than its factorization.

1215388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292 (or 1290 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 1215388 is about 1102.4463705777. The cubic root of 1215388 is about 106.7181565645.

It can be divided in two parts, 12 and 15388, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 1215388 in words is "one million, two hundred fifteen thousand, three hundred eighty-eight".