1215005142 has 16 divisors (see below), whose sum is σ = 2616934320. Its totient is φ = 373847712.

The previous prime is 1215005117. The next prime is 1215005167. The reversal of 1215005142 is 2415005121.

It is an interprime number because it is at equal distance from previous prime (1215005117) and next prime (1215005167).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7788417 + ... + 7788572.

It is an arithmetic number, because the mean of its divisors is an integer number (163558395).

Almost surely, 2^1215005142 is an apocalyptic number.

1215005142 is an abundant number, since it is smaller than the sum of its proper divisors (1401929178).

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

1215005142 is a wasteful number, since it uses less digits than its factorization.

1215005142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15577007.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1215005142 is about 34856.9238746049. The cubic root of 1215005142 is about 1067.0694966573.

Subtracting from 1215005142 its sum of digits (21), we obtain a palindrome (1215005121).

The spelling of 1215005142 in words is "one billion, two hundred fifteen million, five thousand, one hundred forty-two".