1979690 has 8 divisors (see below), whose sum is σ = 3563460. Its totient is φ = 791872.

The previous prime is 1979689. The next prime is 1979713. The reversal of 1979690 is 969791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1708249 + 271441 = 1307^2 + 521^2 .

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

It is a super-2 number, since 2×1979690² = 7838344992200, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 98975 + ... + 98994.

2^1979690 is an apocalyptic number.

1979690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1979690 is a deficient number, since it is larger than the sum of its proper divisors (1583770).

1979690 is a wasteful number, since it uses less digits than its factorization.

1979690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197976.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 1979690 is about 1407.0145699317. The cubic root of 1979690 is about 125.5641698681.

Subtracting from 1979690 its sum of digits (41), we obtain a square (1979649 = 1407²).

The spelling of 1979690 in words is "one million, nine hundred seventy-nine thousand, six hundred ninety".