1992890 has 8 divisors (see below), whose sum is σ = 3587220. Its totient is φ = 797152.

The previous prime is 1992889. The next prime is 1992911. The reversal of 1992890 is 982991.

It can be written as a sum of positive squares in 2 ways, for example, as 1940449 + 52441 = 1393^2 + 229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1992890² = 7943221104200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99635 + ... + 99654.

2^1992890 is an apocalyptic number.

1992890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1992890 is a deficient number, since it is larger than the sum of its proper divisors (1594330).

1992890 is a wasteful number, since it uses less digits than its factorization.

1992890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199296.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1992890 is about 1411.6975596777. The cubic root of 1992890 is about 125.8426270736.

It can be divided in two parts, 1992 and 890, that added together give a palindrome (2882).

The spelling of 1992890 in words is "one million, nine hundred ninety-two thousand, eight hundred ninety".