1989390 has 32 divisors (see below), whose sum is σ = 5142816. Its totient is φ = 489600.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989390 is 939891.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 15 ways as a sum of consecutive naturals, for example, 2161 + ... + 2940.

It is an arithmetic number, because the mean of its divisors is an integer number (160713).

2^1989390 is an apocalyptic number.

1989390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989390 is an abundant number, since it is smaller than the sum of its proper divisors (3153426).

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

1989390 is a wasteful number, since it uses less digits than its factorization.

1989390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124.

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

The square root of 1989390 is about 1410.4573726278. The cubic root of 1989390 is about 125.7689138076.

The spelling of 1989390 in words is "one million, nine hundred eighty-nine thousand, three hundred ninety".