1215965542 has 24 divisors (see below), whose sum is σ = 2012396400. Its totient is φ = 550627440.

The previous prime is 1215965537. The next prime is 1215965549. The reversal of 1215965542 is 2455695121.

It is a junction number, because it is equal to n+sod(n) for n = 1215965495 and 1215965504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215965549) 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, 55759 + ... + 74437.

It is an arithmetic number, because the mean of its divisors is an integer number (83849850).

Almost surely, 2^1215965542 is an apocalyptic number.

1215965542 is a deficient number, since it is larger than the sum of its proper divisors (796430858).

1215965542 is a wasteful number, since it uses less digits than its factorization.

1215965542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18972 (or 18961 counting only the distinct ones).

The product of its digits is 108000, while the sum is 40.

The square root of 1215965542 is about 34870.6974693653. The cubic root of 1215965542 is about 1067.3505773997.

The spelling of 1215965542 in words is "one billion, two hundred fifteen million, nine hundred sixty-five thousand, five hundred forty-two".