1656489 has 8 divisors (see below), whose sum is σ = 2260192. Its totient is φ = 1078560.

The previous prime is 1656427. The next prime is 1656491. The reversal of 1656489 is 9846561.

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

It is not a de Polignac number, because 1656489 - 2¹¹ = 1654441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656689) 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, 6292 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (282524).

2^1656489 is an apocalyptic number.

It is an amenable number.

1656489 is a deficient number, since it is larger than the sum of its proper divisors (603703).

1656489 is a wasteful number, since it uses less digits than its factorization.

1656489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12887.

The product of its digits is 51840, while the sum is 39.

The square root of 1656489 is about 1287.0466192023. The cubic root of 1656489 is about 118.3212780595.

It can be divided in two parts, 16564 and 89, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 1656489 in words is "one million, six hundred fifty-six thousand, four hundred eighty-nine".