1215391592704 has 27 divisors (see below), whose sum is σ = 2426070771943. Its totient is φ = 607686976768.

The previous prime is 1215391592699. The next prime is 1215391592713. The reversal of 1215391592704 is 4072951935121.

The square root of 1215391592704 is 1102448.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17604717 + ... + 17673619.

Almost surely, 2^{1215391592704} is an apocalyptic number.

1215391592704 is the 1102448-th square number.

It is an amenable number.

1215391592704 is a deficient number, since it is larger than the sum of its proper divisors (1210679179239).

1215391592704 is an frugal number, since it uses more digits than its factorization.

1215391592704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137822 (or 68905 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 49.

Multiplying 1215391592704 by its sum of digits (49), we get a square (59554188042496 = 7717136²).

The spelling of 1215391592704 in words is "one trillion, two hundred fifteen billion, three hundred ninety-one million, five hundred ninety-two thousand, seven hundred four".