1979405 has 8 divisors (see below), whose sum is σ = 2426112. Its totient is φ = 1549648.

The previous prime is 1979399. The next prime is 1979413. The reversal of 1979405 is 5049791.

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

It is a cyclic number.

It is not a de Polignac number, because 1979405 - 2⁸ = 1979149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3977 + ... + 4446.

It is an arithmetic number, because the mean of its divisors is an integer number (303264).

2^1979405 is an apocalyptic number.

It is an amenable number.

1979405 is a deficient number, since it is larger than the sum of its proper divisors (446707).

1979405 is an equidigital number, since it uses as much as digits as its factorization.

1979405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8475.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1979405 is about 1406.9132880174. The cubic root of 1979405 is about 125.5581440920.

The spelling of 1979405 in words is "one million, nine hundred seventy-nine thousand, four hundred five".