1978379 has 4 divisors (see below), whose sum is σ = 2130576. Its totient is φ = 1826184.

The previous prime is 1978363. The next prime is 1978393. The reversal of 1978379 is 9738791.

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 1978379 - 2⁴ = 1978363 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978349) 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, 76079 + ... + 76104.

It is an arithmetic number, because the mean of its divisors is an integer number (532644).

2^1978379 is an apocalyptic number.

1978379 is a deficient number, since it is larger than the sum of its proper divisors (152197).

1978379 is a wasteful number, since it uses less digits than its factorization.

1978379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152196.

The product of its digits is 95256, while the sum is 44.

The square root of 1978379 is about 1406.5486127397. The cubic root of 1978379 is about 125.5364465078.

The spelling of 1978379 in words is "one million, nine hundred seventy-eight thousand, three hundred seventy-nine".