1938890 has 16 divisors (see below), whose sum is σ = 3575880. Its totient is φ = 756480.

The previous prime is 1938889. The next prime is 1938907. The reversal of 1938890 is 988391.

It can be written as a sum of positive squares in 4 ways, for example, as 452929 + 1485961 = 673^2 + 1219^2 .

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955 + ... + 2774.

2^1938890 is an apocalyptic number.

1938890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1938890 is a deficient number, since it is larger than the sum of its proper divisors (1636990).

1938890 is a wasteful number, since it uses less digits than its factorization.

1938890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4777.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1938890 is about 1392.4403039269. The cubic root of 1938890 is about 124.6955792258.

The spelling of 1938890 in words is "one million, nine hundred thirty-eight thousand, eight hundred ninety".