1215406445 has 16 divisors (see below), whose sum is σ = 1594276992. Its totient is φ = 882154560.

The previous prime is 1215406397. The next prime is 1215406447. The reversal of 1215406445 is 5446045121.

It is not a de Polignac number, because 1215406445 - 2⁸ = 1215406189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215406447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5699 + ... + 49631.

It is an arithmetic number, because the mean of its divisors is an integer number (99642312).

Almost surely, 2^1215406445 is an apocalyptic number.

It is an amenable number.

1215406445 is a deficient number, since it is larger than the sum of its proper divisors (378870547).

1215406445 is a wasteful number, since it uses less digits than its factorization.

1215406445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44452.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 1215406445 is about 34862.6798310170. The cubic root of 1215406445 is about 1067.1869642132.

The spelling of 1215406445 in words is "one billion, two hundred fifteen million, four hundred six thousand, four hundred forty-five".