1199920380 has 48 divisors (see below), whose sum is σ = 3364986240. Its totient is φ = 319482688.

The previous prime is 1199920369. The next prime is 1199920399. The reversal of 1199920380 is 830299911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24367 + ... + 54713.

It is an arithmetic number, because the mean of its divisors is an integer number (70103880).

Almost surely, 2^1199920380 is an apocalyptic number.

1199920380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1199920380 is an abundant number, since it is smaller than the sum of its proper divisors (2165065860).

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

1199920380 is a wasteful number, since it uses less digits than its factorization.

1199920380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31018 (or 31016 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 1199920380 is about 34639.8669166035. The cubic root of 1199920380 is about 1062.6350661974.

The spelling of 1199920380 in words is "one billion, one hundred ninety-nine million, nine hundred twenty thousand, three hundred eighty".