1990955 has 16 divisors (see below), whose sum is σ = 2579040. Its totient is φ = 1469952.

The previous prime is 1990951. The next prime is 1990957. The reversal of 1990955 is 5590991.

It is a cyclic number.

It is not a de Polignac number, because 1990955 - 2² = 1990951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1990951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4817 + ... + 5213.

It is an arithmetic number, because the mean of its divisors is an integer number (161190).

2^1990955 is an apocalyptic number.

1990955 is a deficient number, since it is larger than the sum of its proper divisors (588085).

1990955 is a wasteful number, since it uses less digits than its factorization.

1990955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 18225, while the sum is 38.

The square root of 1990955 is about 1411.0120481413. The cubic root of 1990955 is about 125.8018848455.

The spelling of 1990955 in words is "one million, nine hundred ninety thousand, nine hundred fifty-five".