1978239 has 16 divisors (see below), whose sum is σ = 2833920. Its totient is φ = 1223040.

The previous prime is 1978219. The next prime is 1978267. The reversal of 1978239 is 9328791.

It is not a de Polignac number, because 1978239 - 2⁷ = 1978111 is a prime.

It is a super-2 number, since 2×1978239² = 7826859082242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1978197 and 1978206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978219) 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, 3784 + ... + 4274.

It is an arithmetic number, because the mean of its divisors is an integer number (177120).

2^1978239 is an apocalyptic number.

1978239 is a deficient number, since it is larger than the sum of its proper divisors (855681).

1978239 is a wasteful number, since it uses less digits than its factorization.

1978239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590.

The product of its digits is 27216, while the sum is 39.

The square root of 1978239 is about 1406.4988446494. The cubic root of 1978239 is about 125.5334852422.

The spelling of 1978239 in words is "one million, nine hundred seventy-eight thousand, two hundred thirty-nine".