1215042646 has 8 divisors (see below), whose sum is σ = 1835676360. Its totient is φ = 603150528.

The previous prime is 1215042641. The next prime is 1215042659. The reversal of 1215042646 is 6462405121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×1215042646⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215042641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185051 + ... + 2185606.

It is an arithmetic number, because the mean of its divisors is an integer number (229459545).

Almost surely, 2^1215042646 is an apocalyptic number.

1215042646 is a deficient number, since it is larger than the sum of its proper divisors (620633714).

1215042646 is a wasteful number, since it uses less digits than its factorization.

1215042646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370798.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1215042646 is about 34857.4618410463. The cubic root of 1215042646 is about 1067.0804757501.

Adding to 1215042646 its reverse (6462405121), we get a palindrome (7677447767).

The spelling of 1215042646 in words is "one billion, two hundred fifteen million, forty-two thousand, six hundred forty-six".