1215379044 has 72 divisors (see below), whose sum is σ = 3397491552. Its totient is φ = 363242880.

The previous prime is 1215379037. The next prime is 1215379141. The reversal of 1215379044 is 4409735121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7887 + ... + 49929.

Almost surely, 2^1215379044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215379044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1698745776).

1215379044 is an abundant number, since it is smaller than the sum of its proper divisors (2182112508).

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

1215379044 is a wasteful number, since it uses less digits than its factorization.

1215379044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42137 (or 42132 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1215379044 is about 34862.2868440956. The cubic root of 1215379044 is about 1067.1789443420.

The spelling of 1215379044 in words is "one billion, two hundred fifteen million, three hundred seventy-nine thousand, forty-four".