1649989 has 8 divisors (see below), whose sum is σ = 1830240. Its totient is φ = 1474800.

The previous prime is 1649987. The next prime is 1649993. The reversal of 1649989 is 9899461.

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

It is a cyclic number.

It is not a de Polignac number, because 1649989 - 2¹ = 1649987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649981) 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, 559 + ... + 1900.

It is an arithmetic number, because the mean of its divisors is an integer number (228780).

2^1649989 is an apocalyptic number.

It is an amenable number.

1649989 is a deficient number, since it is larger than the sum of its proper divisors (180251).

1649989 is a wasteful number, since it uses less digits than its factorization.

1649989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531.

The product of its digits is 139968, while the sum is 46.

The square root of 1649989 is about 1284.5189761152. The cubic root of 1649989 is about 118.1663124538.

It can be divided in two parts, 164 and 9989, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 1649989 in words is "one million, six hundred forty-nine thousand, nine hundred eighty-nine".