1199640924 has 72 divisors (see below), whose sum is σ = 3196851840. Its totient is φ = 378261792.

The previous prime is 1199640919. The next prime is 1199640947. The reversal of 1199640924 is 4290469911.

It is a self number, because there is not a number n which added to its sum of digits gives 1199640924.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 876889 + ... + 878255.

It is an arithmetic number, because the mean of its divisors is an integer number (44400720).

Almost surely, 2^1199640924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1199640924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598425920).

1199640924 is an abundant number, since it is smaller than the sum of its proper divisors (1997210916).

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

1199640924 is a wasteful number, since it uses less digits than its factorization.

1199640924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679 (or 2674 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1199640924 is about 34635.8329479746. The cubic root of 1199640924 is about 1062.5525655009.

The spelling of 1199640924 in words is "one billion, one hundred ninety-nine million, six hundred forty thousand, nine hundred twenty-four".