1989357 has 16 divisors (see below), whose sum is σ = 2957760. Its totient is φ = 1181952.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989357 is 7539891.

It is a happy number.

It is not a de Polignac number, because 1989357 - 2² = 1989353 is a prime.

1989357 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989353) 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, 58 + ... + 1995.

It is an arithmetic number, because the mean of its divisors is an integer number (184860).

2^1989357 is an apocalyptic number.

1989357 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1989357 is a deficient number, since it is larger than the sum of its proper divisors (968403).

1989357 is a wasteful number, since it uses less digits than its factorization.

1989357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092.

The product of its digits is 68040, while the sum is 42.

The square root of 1989357 is about 1410.4456742463. The cubic root of 1989357 is about 125.7682183855.

It can be divided in two parts, 1989 and 357, that added together give a triangular number (2346 = T₆₈).

The spelling of 1989357 in words is "one million, nine hundred eighty-nine thousand, three hundred fifty-seven".