1979951 has 4 divisors (see below), whose sum is σ = 1983912. Its totient is φ = 1975992.

The previous prime is 1979947. The next prime is 1979993. The reversal of 1979951 is 1599791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1599791 = 383 ⋅4177.

It is a cyclic number.

It is not a de Polignac number, because 1979951 - 2² = 1979947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1979899 and 1979908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100 + ... + 2273.

It is an arithmetic number, because the mean of its divisors is an integer number (495978).

2^1979951 is an apocalyptic number.

1979951 is a deficient number, since it is larger than the sum of its proper divisors (3961).

1979951 is an equidigital number, since it uses as much as digits as its factorization.

1979951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960.

The product of its digits is 25515, while the sum is 41.

The square root of 1979951 is about 1407.1073164475. The cubic root of 1979951 is about 125.5696877031.

The spelling of 1979951 in words is "one million, nine hundred seventy-nine thousand, nine hundred fifty-one".