1890979 has 4 divisors (see below), whose sum is σ = 1894984. Its totient is φ = 1886976.

The previous prime is 1890953. The next prime is 1890997. The reversal of 1890979 is 9790981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1890979 - 2⁷ = 1890851 is a prime.

It is an Ulam number.

It is a Duffinian number.

1890979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1890079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182 + ... + 2275.

It is an arithmetic number, because the mean of its divisors is an integer number (473746).

2^1890979 is an apocalyptic number.

1890979 is a deficient number, since it is larger than the sum of its proper divisors (4005).

1890979 is an equidigital number, since it uses as much as digits as its factorization.

1890979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1890979 is about 1375.1287212476. The cubic root of 1890979 is about 123.6599031311.

The spelling of 1890979 in words is "one million, eight hundred ninety thousand, nine hundred seventy-nine".