1215253400 has 24 divisors (see below), whose sum is σ = 2825464620. Its totient is φ = 486101280.

The previous prime is 1215253379. The next prime is 1215253421. The reversal of 1215253400 is 43525121.

It is an interprime number because it is at equal distance from previous prime (1215253379) and next prime (1215253421).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3037934 + ... + 3038333.

Almost surely, 2^1215253400 is an apocalyptic number.

1215253400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215253400 is an abundant number, since it is smaller than the sum of its proper divisors (1610211220).

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

1215253400 is a wasteful number, since it uses less digits than its factorization.

1215253400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6076283 (or 6076274 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1215253400 is about 34860.4847929572. The cubic root of 1215253400 is about 1067.1421686401.

Adding to 1215253400 its reverse (43525121), we get a palindrome (1258778521).

The spelling of 1215253400 in words is "one billion, two hundred fifteen million, two hundred fifty-three thousand, four hundred".