1899378732 has 54 divisors (see below), whose sum is σ = 4641437388. Its totient is φ = 604491888.

The previous prime is 1899378707. The next prime is 1899378739. The reversal of 1899378732 is 2378739981.

It is not an unprimeable number, because it can be changed into a prime (1899378739) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3472083 + ... + 3472629.

Almost surely, 2^1899378732 is an apocalyptic number.

1899378732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1899378732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2320718694).

1899378732 is an abundant number, since it is smaller than the sum of its proper divisors (2742058656).

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

1899378732 is an equidigital number, since it uses as much as digits as its factorization.

1899378732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 575 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 57.

The square root of 1899378732 is about 43581.8624200481. The cubic root of 1899378732 is about 1238.4273185731.

The spelling of 1899378732 in words is "one billion, eight hundred ninety-nine million, three hundred seventy-eight thousand, seven hundred thirty-two".