1215397903 has 4 divisors (see below), whose sum is σ = 1216823608. Its totient is φ = 1213972200.

The previous prime is 1215397879. The next prime is 1215397969. The reversal of 1215397903 is 3097935121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215397903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215397103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711573 + ... + 713278.

It is an arithmetic number, because the mean of its divisors is an integer number (304205902).

Almost surely, 2^1215397903 is an apocalyptic number.

1215397903 is a deficient number, since it is larger than the sum of its proper divisors (1425705).

1215397903 is an equidigital number, since it uses as much as digits as its factorization.

1215397903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425704.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 1215397903 is about 34862.5573215735. The cubic root of 1215397903 is about 1067.1844641079.

The spelling of 1215397903 in words is "one billion, two hundred fifteen million, three hundred ninety-seven thousand, nine hundred three".