1215383870 has 16 divisors (see below), whose sum is σ = 2188654128. Its totient is φ = 485939520.

The previous prime is 1215383833. The next prime is 1215383879. The reversal of 1215383870 is 783835121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215383879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1796 + ... + 49335.

It is an arithmetic number, because the mean of its divisors is an integer number (136790883).

Almost surely, 2^1215383870 is an apocalyptic number.

1215383870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215383870 is a deficient number, since it is larger than the sum of its proper divisors (973270258).

1215383870 is a wasteful number, since it uses less digits than its factorization.

1215383870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53515.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1215383870 is about 34862.3560592224. The cubic root of 1215383870 is about 1067.1803568502.

The spelling of 1215383870 in words is "one billion, two hundred fifteen million, three hundred eighty-three thousand, eight hundred seventy".