1215572400 has 360 divisors, whose sum is σ = 5035101840. Its totient is φ = 277724160.

The previous prime is 1215572399. The next prime is 1215572401. The reversal of 1215572400 is 42755121.

It is an interprime number because it is at equal distance from previous prime (1215572399) and next prime (1215572401).

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1215572401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 528052 + ... + 530348.

It is an arithmetic number, because the mean of its divisors is an integer number (13986394).

Almost surely, 2^1215572400 is an apocalyptic number.

1215572400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215572400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2517550920).

1215572400 is an abundant number, since it is smaller than the sum of its proper divisors (3819529440).

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

1215572400 is a wasteful number, since it uses less digits than its factorization.

1215572400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338 (or 2314 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 1215572400 is about 34865.0598737475. The cubic root of 1215572400 is about 1067.2355342350.

The spelling of 1215572400 in words is "one billion, two hundred fifteen million, five hundred seventy-two thousand, four hundred".