1215640200 has 96 divisors (see below), whose sum is σ = 3890108160. Its totient is φ = 313708800.

The previous prime is 1215640187. The next prime is 1215640243. The reversal of 1215640200 is 20465121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14079 + ... + 51278.

It is an arithmetic number, because the mean of its divisors is an integer number (40521960).

Almost surely, 2^1215640200 is an apocalyptic number.

1215640200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215640200 is an abundant number, since it is smaller than the sum of its proper divisors (2674467960).

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

1215640200 is a wasteful number, since it uses less digits than its factorization.

1215640200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65407 (or 65398 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1215640200 is about 34866.0321803328. The cubic root of 1215640200 is about 1067.2553759776.

The spelling of 1215640200 in words is "one billion, two hundred fifteen million, six hundred forty thousand, two hundred".