1215798645 has 16 divisors (see below), whose sum is σ = 1949490432. Its totient is φ = 647021760.

The previous prime is 1215798637. The next prime is 1215798709. The reversal of 1215798645 is 5468975121.

It is a happy number.

It is not a de Polignac number, because 1215798645 - 2³ = 1215798637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1215798594 and 1215798603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80586 + ... + 94475.

It is an arithmetic number, because the mean of its divisors is an integer number (121843152).

Almost surely, 2^1215798645 is an apocalyptic number.

1215798645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215798645 is a deficient number, since it is larger than the sum of its proper divisors (733691787).

1215798645 is a wasteful number, since it uses less digits than its factorization.

1215798645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175532.

The product of its digits is 604800, while the sum is 48.

The square root of 1215798645 is about 34868.3043034788. The cubic root of 1215798645 is about 1067.3017422000.

The spelling of 1215798645 in words is "one billion, two hundred fifteen million, seven hundred ninety-eight thousand, six hundred forty-five".