1219399971840 has 1056 divisors, whose sum is σ = 4683236253696. Its totient is φ = 303495413760.

The previous prime is 1219399971827. The next prime is 1219399971869. The reversal of 1219399971840 is 481799939121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1230473745 + ... + 1230474735.

It is an arithmetic number, because the mean of its divisors is an integer number (4434882816).

Almost surely, 2^{1219399971840} is an apocalyptic number.

1219399971840 is a gapful number since it is divisible by the number (10) 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 1219399971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2341618126848).

1219399971840 is an abundant number, since it is smaller than the sum of its proper divisors (3463836281856).

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

1219399971840 is an equidigital number, since it uses as much as digits as its factorization.

1219399971840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 63.

The spelling of 1219399971840 in words is "one trillion, two hundred nineteen billion, three hundred ninety-nine million, nine hundred seventy-one thousand, eight hundred forty".