1669716 has 18 divisors (see below), whose sum is σ = 4220762. Its totient is φ = 556560.

The previous prime is 1669697. The next prime is 1669727. The reversal of 1669716 is 6179661.

It can be written as a sum of positive squares in only one way, i.e., 1512900 + 156816 = 1230^2 + 396^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 46381 = 1669716 / (1 + 6 + 6 + 9 + 7 + 1 + 6).

It is a nialpdrome in base 6.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23155 + ... + 23226.

2^1669716 is an apocalyptic number.

It is an amenable number.

1669716 is an abundant number, since it is smaller than the sum of its proper divisors (2551046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1669716 is a wasteful number, since it uses less digits than its factorization.

1669716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46391 (or 46386 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 1669716 is about 1292.1749107609. The cubic root of 1669716 is about 118.6353737852.

The spelling of 1669716 in words is "one million, six hundred sixty-nine thousand, seven hundred sixteen".