1491389 has 8 divisors (see below), whose sum is σ = 1583232. Its totient is φ = 1401840.

The previous prime is 1491377. The next prime is 1491401. The reversal of 1491389 is 9831941.

It is an interprime number because it is at equal distance from previous prime (1491377) and next prime (1491401).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491389 is a prime.

It is a super-2 number, since 2×1491389² = 4448482298642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872 + ... + 1934.

It is an arithmetic number, because the mean of its divisors is an integer number (197904).

2^1491389 is an apocalyptic number.

It is an amenable number.

1491389 is a deficient number, since it is larger than the sum of its proper divisors (91843).

1491389 is a wasteful number, since it uses less digits than its factorization.

1491389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147.

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

The square root of 1491389 is about 1221.2243856065. The cubic root of 1491389 is about 114.2519563241.

The spelling of 1491389 in words is "one million, four hundred ninety-one thousand, three hundred eighty-nine".