1990774 has 4 divisors (see below), whose sum is σ = 2986164. Its totient is φ = 995386.

The previous prime is 1990759. The next prime is 1990787. The reversal of 1990774 is 4770991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4770991 = 631 ⋅7561.

It is a super-2 number, since 2×1990774² = 7926362238152, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 497692 + ... + 497695.

It is an arithmetic number, because the mean of its divisors is an integer number (746541).

2^1990774 is an apocalyptic number.

1990774 is a deficient number, since it is larger than the sum of its proper divisors (995390).

1990774 is an equidigital number, since it uses as much as digits as its factorization.

1990774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995389.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 1990774 is about 1410.9479083226. The cubic root of 1990774 is about 125.7980724655.

The spelling of 1990774 in words is "one million, nine hundred ninety thousand, seven hundred seventy-four".