1215189903438 has 96 divisors (see below), whose sum is σ = 3063971988480. Its totient is φ = 340879855680.

The previous prime is 1215189903413. The next prime is 1215189903439. The reversal of 1215189903438 is 8343099815121.

It is a happy number.

1215189903438 is a `hidden beast` number, since 1 + 2 + 1 + 518 + 9 + 90 + 3 + 4 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215189903439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4059723 + ... + 4348761.

It is an arithmetic number, because the mean of its divisors is an integer number (31916374880).

Almost surely, 2^{1215189903438} is an apocalyptic number.

1215189903438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215189903438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531985994240).

1215189903438 is an abundant number, since it is smaller than the sum of its proper divisors (1848782085042).

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

1215189903438 is a wasteful number, since it uses less digits than its factorization.

1215189903438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289662 (or 289659 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 1215189903438 in words is "one trillion, two hundred fifteen billion, one hundred eighty-nine million, nine hundred three thousand, four hundred thirty-eight".