1299158403840 has 864 divisors, whose sum is σ = 5102783142912. Its totient is φ = 313860096000.

The previous prime is 1299158403833. The next prime is 1299158403869. The reversal of 1299158403840 is 483048519921.

It is a happy number.

1299158403840 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 158 + 403 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1474640200 + ... + 1474641080.

It is an arithmetic number, because the mean of its divisors is an integer number (5905999008).

Almost surely, 2^{1299158403840} is an apocalyptic number.

1299158403840 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 1299158403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2551391571456).

1299158403840 is an abundant number, since it is smaller than the sum of its proper divisors (3803624739072).

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

1299158403840 is an equidigital number, since it uses as much as digits as its factorization.

1299158403840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 1299158403840 in words is "one trillion, two hundred ninety-nine billion, one hundred fifty-eight million, four hundred three thousand, eight hundred forty".