1215642 has 24 divisors (see below), whose sum is σ = 2548224. Its totient is φ = 386584.

The previous prime is 1215637. The next prime is 1215647. The reversal of 1215642 is 2465121.

It is an interprime number because it is at equal distance from previous prime (1215637) and next prime (1215647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2983 + ... + 3365.

It is an arithmetic number, because the mean of its divisors is an integer number (106176).

2^1215642 is an apocalyptic number.

1215642 is an abundant number, since it is smaller than the sum of its proper divisors (1332582).

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

1215642 is a wasteful number, since it uses less digits than its factorization.

1215642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 411 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 1215642 is about 1102.5615629070. The cubic root of 1215642 is about 106.7255902739.

The spelling of 1215642 in words is "one million, two hundred fifteen thousand, six hundred forty-two".