1391489 has 4 divisors (see below), whose sum is σ = 1518000. Its totient is φ = 1264980.

The previous prime is 1391483. The next prime is 1391519. The reversal of 1391489 is 9841931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9841931 = 11 ⋅894721.

It is a cyclic number.

It is not a de Polignac number, because 1391489 - 2⁸ = 1391233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391483) 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, 63239 + ... + 63260.

It is an arithmetic number, because the mean of its divisors is an integer number (379500).

2^1391489 is an apocalyptic number.

It is an amenable number.

1391489 is a deficient number, since it is larger than the sum of its proper divisors (126511).

1391489 is a wasteful number, since it uses less digits than its factorization.

1391489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126510.

The product of its digits is 7776, while the sum is 35.

The square root of 1391489 is about 1179.6139198907. The cubic root of 1391489 is about 111.6417389470.

The spelling of 1391489 in words is "one million, three hundred ninety-one thousand, four hundred eighty-nine".