1213999488 has 160 divisors (see below), whose sum is σ = 3891185760. Its totient is φ = 373496832.

The previous prime is 1213999487. The next prime is 1213999541. The reversal of 1213999488 is 8849993121.

1213999488 is a `hidden beast` number, since 121 + 39 + 9 + 9 + 488 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213999487) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 130281 + ... + 139287.

It is an arithmetic number, because the mean of its divisors is an integer number (24319911).

Almost surely, 2^1213999488 is an apocalyptic number.

1213999488 is a gapful number since it is divisible by the number (18) 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 1213999488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945592880).

1213999488 is an abundant number, since it is smaller than the sum of its proper divisors (2677186272).

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

1213999488 is an equidigital number, since it uses as much as digits as its factorization.

1213999488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046 (or 9025 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 1213999488 is about 34842.4954330197. The cubic root of 1213999488 is about 1066.7750126056.

The spelling of 1213999488 in words is "one billion, two hundred thirteen million, nine hundred ninety-nine thousand, four hundred eighty-eight".