1215004400 has 60 divisors (see below), whose sum is σ = 3072701400. Its totient is φ = 460419840.

The previous prime is 1215004397. The next prime is 1215004403. The reversal of 1215004400 is 44005121.

It is an interprime number because it is at equal distance from previous prime (1215004397) and next prime (1215004403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215004403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72335 + ... + 87534.

It is an arithmetic number, because the mean of its divisors is an integer number (51211690).

Almost surely, 2^1215004400 is an apocalyptic number.

1215004400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215004400 is an abundant number, since it is smaller than the sum of its proper divisors (1857697000).

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

1215004400 is a wasteful number, since it uses less digits than its factorization.

1215004400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159906 (or 159895 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1215004400 is about 34856.9132310938. The cubic root of 1215004400 is about 1067.0692794385.

Adding to 1215004400 its reverse (44005121), we get a palindrome (1259009521).

The spelling of 1215004400 in words is "one billion, two hundred fifteen million, four thousand, four hundred".