1938990 has 16 divisors (see below), whose sum is σ = 4653648. Its totient is φ = 517056.

The previous prime is 1938983. The next prime is 1938997. The reversal of 1938990 is 998391.

It is an interprime number because it is at equal distance from previous prime (1938983) and next prime (1938997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32287 + ... + 32346.

It is an arithmetic number, because the mean of its divisors is an integer number (290853).

2^1938990 is an apocalyptic number.

1938990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1938990 is an abundant number, since it is smaller than the sum of its proper divisors (2714658).

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

1938990 is a wasteful number, since it uses less digits than its factorization.

1938990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64643.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1938990 is about 1392.4762116460. The cubic root of 1938990 is about 124.6977229512.

The spelling of 1938990 in words is "one million, nine hundred thirty-eight thousand, nine hundred ninety".