1199920813 has 64 divisors (see below), whose sum is σ = 1635450880. Its totient is φ = 853804800.

The previous prime is 1199920807. The next prime is 1199920823. The reversal of 1199920813 is 3180299911.

It is not a de Polignac number, because 1199920813 - 2⁵ = 1199920781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1199920813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1199920823) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3269356 + ... + 3269722.

It is an arithmetic number, because the mean of its divisors is an integer number (25553920).

Almost surely, 2^1199920813 is an apocalyptic number.

1199920813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1199920813 is a deficient number, since it is larger than the sum of its proper divisors (435530067).

1199920813 is a wasteful number, since it uses less digits than its factorization.

1199920813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 1199920813 is about 34639.8731666269. The cubic root of 1199920813 is about 1062.6351940173.

The spelling of 1199920813 in words is "one billion, one hundred ninety-nine million, nine hundred twenty thousand, eight hundred thirteen".