1972239 has 4 divisors (see below), whose sum is σ = 2629656. Its totient is φ = 1314824.

The previous prime is 1972231. The next prime is 1972247. The reversal of 1972239 is 9322791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9322791 = 3 ⋅3107597.

It is an interprime number because it is at equal distance from previous prime (1972231) and next prime (1972247).

It is a cyclic number.

It is not a de Polignac number, because 1972239 - 2³ = 1972231 is a prime.

It is a D-number.

1972239 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972231) 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, 328704 + ... + 328709.

It is an arithmetic number, because the mean of its divisors is an integer number (657414).

2^1972239 is an apocalyptic number.

1972239 is a deficient number, since it is larger than the sum of its proper divisors (657417).

1972239 is an equidigital number, since it uses as much as digits as its factorization.

1972239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657416.

The product of its digits is 6804, while the sum is 33.

The square root of 1972239 is about 1404.3642689844. The cubic root of 1972239 is about 125.4064423380.

It can be divided in two parts, 1972 and 239, that added together give a triangular number (2211 = T₆₆).

The spelling of 1972239 in words is "one million, nine hundred seventy-two thousand, two hundred thirty-nine".