1669916 has 6 divisors (see below), whose sum is σ = 2922360. Its totient is φ = 834956.

The previous prime is 1669897. The next prime is 1669931. The reversal of 1669916 is 6199661.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1669916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208736 + ... + 208743.

It is an arithmetic number, because the mean of its divisors is an integer number (487060).

2^1669916 is an apocalyptic number.

It is an amenable number.

1669916 is a deficient number, since it is larger than the sum of its proper divisors (1252444).

1669916 is a wasteful number, since it uses less digits than its factorization.

1669916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417483 (or 417481 counting only the distinct ones).

The product of its digits is 17496, while the sum is 38.

The square root of 1669916 is about 1292.2522973475. The cubic root of 1669916 is about 118.6401103446.

Subtracting from 1669916 its sum of digits (38), we obtain a triangular number (1669878 = T₁₈₂₇).

The spelling of 1669916 in words is "one million, six hundred sixty-nine thousand, nine hundred sixteen".