1901988 has 48 divisors (see below), whose sum is σ = 5382720. Its totient is φ = 576000.

The previous prime is 1901987. The next prime is 1901993. The reversal of 1901988 is 8891091.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1901981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388 + ... + 1988.

It is an arithmetic number, because the mean of its divisors is an integer number (112140).

2^1901988 is an apocalyptic number.

1901988 is a gapful number since it is divisible by the number (18) 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 1901988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2691360).

1901988 is an abundant number, since it is smaller than the sum of its proper divisors (3480732).

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

1901988 is a wasteful number, since it uses less digits than its factorization.

1901988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1901988 is about 1379.1258100696. The cubic root of 1901988 is about 123.8994154831.

The spelling of 1901988 in words is "one million, nine hundred one thousand, nine hundred eighty-eight".