1931988 has 24 divisors (see below), whose sum is σ = 4546080. Its totient is φ = 638560.

The previous prime is 1931987. The next prime is 1931989. The reversal of 1931988 is 8891391.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1931987) and next prime (1931989).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931983) 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 7 ways as a sum of consecutive naturals, for example, 958 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (189420).

2^1931988 is an apocalyptic number.

It is an amenable number.

1931988 is an abundant number, since it is smaller than the sum of its proper divisors (2614092).

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

1931988 is a wasteful number, since it uses less digits than its factorization.

1931988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367 (or 1365 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 1931988 is about 1389.9597116463. The cubic root of 1931988 is about 124.5474408323.

The spelling of 1931988 in words is "one million, nine hundred thirty-one thousand, nine hundred eighty-eight".