1215860445 has 48 divisors (see below), whose sum is σ = 2249769600. Its totient is φ = 605646720.

The previous prime is 1215860411. The next prime is 1215860449. The reversal of 1215860445 is 5440685121.

It is a happy number.

1215860445 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 8 + 604 + 45 = 666.

1215860445 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1215860445 - 2⁶ = 1215860381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215860449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50691 + ... + 70719.

It is an arithmetic number, because the mean of its divisors is an integer number (46870200).

Almost surely, 2^1215860445 is an apocalyptic number.

1215860445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215860445 is a deficient number, since it is larger than the sum of its proper divisors (1033909155).

1215860445 is a wasteful number, since it uses less digits than its factorization.

1215860445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130 (or 20127 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 1215860445 is about 34869.1904838641. The cubic root of 1215860445 is about 1067.3198258222.

The spelling of 1215860445 in words is "one billion, two hundred fifteen million, eight hundred sixty thousand, four hundred forty-five".