1215200450 has 24 divisors (see below), whose sum is σ = 2264922000. Its totient is φ = 485080400.

The previous prime is 1215200447. The next prime is 1215200453. The reversal of 1215200450 is 540025121.

It is an interprime number because it is at equal distance from previous prime (1215200447) and next prime (1215200453).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1215200453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200 + ... + 49299.

It is an arithmetic number, because the mean of its divisors is an integer number (94371750).

Almost surely, 2^1215200450 is an apocalyptic number.

1215200450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215200450 is a deficient number, since it is larger than the sum of its proper divisors (1049721550).

1215200450 is a wasteful number, since it uses less digits than its factorization.

1215200450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50002 (or 49997 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1215200450 is about 34859.7253288089. The cubic root of 1215200450 is about 1067.1266695411.

Adding to 1215200450 its reverse (540025121), we get a palindrome (1755225571).

The spelling of 1215200450 in words is "one billion, two hundred fifteen million, two hundred thousand, four hundred fifty".