1215542016 has 108 divisors (see below), whose sum is σ = 3774393168. Its totient is φ = 374003712.

The previous prime is 1215541979. The next prime is 1215542021. The reversal of 1215542016 is 6102455121.

It is a super-2 number, since 2×1215542016² = 2955084785322688512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9661 + ... + 50243.

Almost surely, 2^1215542016 is an apocalyptic number.

1215542016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215542016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1887196584).

1215542016 is an abundant number, since it is smaller than the sum of its proper divisors (2558851152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215542016 is a wasteful number, since it uses less digits than its factorization.

1215542016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40618 (or 40601 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1215542016 is about 34864.6241339269. The cubic root of 1215542016 is about 1067.2266420855.

Adding to 1215542016 its reverse (6102455121), we get a palindrome (7317997137).

The spelling of 1215542016 in words is "one billion, two hundred fifteen million, five hundred forty-two thousand, sixteen".