1272389 has 4 divisors (see below), whose sum is σ = 1276224. Its totient is φ = 1268556.

The previous prime is 1272379. The next prime is 1272409. The reversal of 1272389 is 9832721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1272389 - 2⁸ = 1272133 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272329) 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, 1367 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (319056).

2^1272389 is an apocalyptic number.

It is an amenable number.

1272389 is a deficient number, since it is larger than the sum of its proper divisors (3835).

1272389 is an equidigital number, since it uses as much as digits as its factorization.

1272389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3834.

The product of its digits is 6048, while the sum is 32.

The square root of 1272389 is about 1128.0022163099. The cubic root of 1272389 is about 108.3610742896.

It can be divided in two parts, 1272 and 389, that added together give a palindrome (1661).

The spelling of 1272389 in words is "one million, two hundred seventy-two thousand, three hundred eighty-nine".