1215040002 has 64 divisors (see below), whose sum is σ = 2727139968. Its totient is φ = 357696000.

The previous prime is 1215039977. The next prime is 1215040027. The reversal of 1215040002 is 2000405121.

It is an interprime number because it is at equal distance from previous prime (1215039977) and next prime (1215040027).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 748752 + ... + 750372.

It is an arithmetic number, because the mean of its divisors is an integer number (42611562).

Almost surely, 2^1215040002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215040002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1363569984).

1215040002 is an abundant number, since it is smaller than the sum of its proper divisors (1512099966).

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

1215040002 is a wasteful number, since it uses less digits than its factorization.

1215040002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1215040002 is about 34857.4239151432. The cubic root of 1215040002 is about 1067.0797017408.

Adding to 1215040002 its reverse (2000405121), we get a palindrome (3215445123).

The spelling of 1215040002 in words is "one billion, two hundred fifteen million, forty thousand, two".