1199640923 has 24 divisors (see below), whose sum is σ = 1378736640. Its totient is φ = 1041062880.

The previous prime is 1199640919. The next prime is 1199640947. The reversal of 1199640923 is 3290469911.

It is a happy number.

It is not a de Polignac number, because 1199640923 - 2² = 1199640919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1199640223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226718 + ... + 231948.

It is an arithmetic number, because the mean of its divisors is an integer number (57447360).

Almost surely, 2^1199640923 is an apocalyptic number.

1199640923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1199640923 is a deficient number, since it is larger than the sum of its proper divisors (179095717).

1199640923 is a wasteful number, since it uses less digits than its factorization.

1199640923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5339 (or 5326 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 1199640923 is about 34635.8329335386. The cubic root of 1199640923 is about 1062.5525652056.

The spelling of 1199640923 in words is "one billion, one hundred ninety-nine million, six hundred forty thousand, nine hundred twenty-three".