1990779 has 16 divisors (see below), whose sum is σ = 3099648. Its totient is φ = 1112832.

The previous prime is 1990759. The next prime is 1990787. The reversal of 1990779 is 9770991.

It is not a de Polignac number, because 1990779 - 2⁸ = 1990523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1990779.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22 + ... + 1995.

It is an arithmetic number, because the mean of its divisors is an integer number (193728).

2^1990779 is an apocalyptic number.

1990779 is a deficient number, since it is larger than the sum of its proper divisors (1108869).

1990779 is a wasteful number, since it uses less digits than its factorization.

1990779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074.

The product of its (nonzero) digits is 35721, while the sum is 42.

The square root of 1990779 is about 1410.9496801800. The cubic root of 1990779 is about 125.7981777829.

The spelling of 1990779 in words is "one million, nine hundred ninety thousand, seven hundred seventy-nine".