1215138 has 32 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 380880.

The previous prime is 1215133. The next prime is 1215157. The reversal of 1215138 is 8315121.

It is not an unprimeable number, because it can be changed into a prime (1215133) 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, 8673 + ... + 8811.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2^1215138 is an apocalyptic number.

1215138 is an abundant number, since it is smaller than the sum of its proper divisors (1365342).

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

1215138 is a wasteful number, since it uses less digits than its factorization.

1215138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222.

The product of its digits is 240, while the sum is 21.

The square root of 1215138 is about 1102.3329805463. The cubic root of 1215138 is about 106.7108389100.

The spelling of 1215138 in words is "one million, two hundred fifteen thousand, one hundred thirty-eight".