1215331442 has 16 divisors (see below), whose sum is σ = 1996505280. Its totient is φ = 551414352.

The previous prime is 1215331421. The next prime is 1215331483. The reversal of 1215331442 is 2441335121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394598 + ... + 397665.

It is an arithmetic number, because the mean of its divisors is an integer number (124781580).

Almost surely, 2^1215331442 is an apocalyptic number.

1215331442 is a deficient number, since it is larger than the sum of its proper divisors (781173838).

1215331442 is a wasteful number, since it uses less digits than its factorization.

1215331442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792337.

The product of its digits is 2880, while the sum is 26.

The square root of 1215331442 is about 34861.6041225874. The cubic root of 1215331442 is about 1067.1650116473.

Adding to 1215331442 its reverse (2441335121), we get a palindrome (3656666563).

The spelling of 1215331442 in words is "one billion, two hundred fifteen million, three hundred thirty-one thousand, four hundred forty-two".