1990357 has 4 divisors (see below), whose sum is σ = 2059020. Its totient is φ = 1921696.

The previous prime is 1990337. The next prime is 1990361. The reversal of 1990357 is 7530991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1274641 + 715716 = 1129^2 + 846^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990357 - 2⁷ = 1990229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34288 + ... + 34345.

It is an arithmetic number, because the mean of its divisors is an integer number (514755).

2^1990357 is an apocalyptic number.

It is an amenable number.

1990357 is a deficient number, since it is larger than the sum of its proper divisors (68663).

1990357 is an equidigital number, since it uses as much as digits as its factorization.

1990357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68662.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 1990357 is about 1410.8001275872. The cubic root of 1990357 is about 125.7892883679.

The spelling of 1990357 in words is "one million, nine hundred ninety thousand, three hundred fifty-seven".