1990365 has 32 divisors (see below), whose sum is σ = 3507840. Its totient is φ = 957696.

The previous prime is 1990361. The next prime is 1990379. The reversal of 1990365 is 5630991.

It is not a de Polignac number, because 1990365 - 2² = 1990361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11419 + ... + 11591.

It is an arithmetic number, because the mean of its divisors is an integer number (109620).

2^1990365 is an apocalyptic number.

1990365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1990365 is a deficient number, since it is larger than the sum of its proper divisors (1517475).

1990365 is a wasteful number, since it uses less digits than its factorization.

1990365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 1990365 is about 1410.8029628548. The cubic root of 1990365 is about 125.7894568993.

The spelling of 1990365 in words is "one million, nine hundred ninety thousand, three hundred sixty-five".