1990810 has 8 divisors (see below), whose sum is σ = 3583476. Its totient is φ = 796320.

The previous prime is 1990787. The next prime is 1990823. The reversal of 1990810 is 180991.

It can be written as a sum of positive squares in 2 ways, for example, as 1595169 + 395641 = 1263^2 + 629^2 .

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

It is a super-2 number, since 2×1990810² = 7926648912200, which contains 22 as substring.

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, 99531 + ... + 99550.

2^1990810 is an apocalyptic number.

1990810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990810 is a deficient number, since it is larger than the sum of its proper divisors (1592666).

1990810 is a wasteful number, since it uses less digits than its factorization.

1990810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199088.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1990810 is about 1410.9606656459. The cubic root of 1990810 is about 125.7988307473.

The spelling of 1990810 in words is "one million, nine hundred ninety thousand, eight hundred ten".