1994090 has 32 divisors (see below), whose sum is σ = 4178304. Its totient is φ = 671040.

The previous prime is 1994087. The next prime is 1994093. The reversal of 1994090 is 904991.

It is an interprime number because it is at equal distance from previous prime (1994087) and next prime (1994093).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1994093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4037 + ... + 4503.

It is an arithmetic number, because the mean of its divisors is an integer number (130572).

2^1994090 is an apocalyptic number.

1994090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1994090 is an abundant number, since it is smaller than the sum of its proper divisors (2184214).

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

1994090 is a wasteful number, since it uses less digits than its factorization.

1994090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1994090 is about 1412.1225159312. The cubic root of 1994090 is about 125.8678803243.

The spelling of 1994090 in words is "one million, nine hundred ninety-four thousand, ninety".