1899780040 has 16 divisors (see below), whose sum is σ = 4274505180. Its totient is φ = 759912000.

The previous prime is 1899780031. The next prime is 1899780041. The reversal of 1899780040 is 400879981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1896950916 + 2829124 = 43554^2 + 1682^2 .

It is not an unprimeable number, because it can be changed into a prime (1899780041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23747211 + ... + 23747290.

Almost surely, 2^1899780040 is an apocalyptic number.

1899780040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1899780040 is an abundant number, since it is smaller than the sum of its proper divisors (2374725140).

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

1899780040 is a wasteful number, since it uses less digits than its factorization.

1899780040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47494512 (or 47494508 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 1899780040 is about 43586.4662481372. The cubic root of 1899780040 is about 1238.5145323172.

The spelling of 1899780040 in words is "one billion, eight hundred ninety-nine million, seven hundred eighty thousand, forty".