1668724 has 6 divisors (see below), whose sum is σ = 2920274. Its totient is φ = 834360.

The previous prime is 1668721. The next prime is 1668727. The reversal of 1668724 is 4278661.

It is an interprime number because it is at equal distance from previous prime (1668721) and next prime (1668727).

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 4624 = 1290^2 + 68^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1668724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208587 + ... + 208594.

2^1668724 is an apocalyptic number.

It is an amenable number.

1668724 is a deficient number, since it is larger than the sum of its proper divisors (1251550).

1668724 is a wasteful number, since it uses less digits than its factorization.

1668724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417185 (or 417183 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 1668724 is about 1291.7910047682. The cubic root of 1668724 is about 118.6118748578.

The spelling of 1668724 in words is "one million, six hundred sixty-eight thousand, seven hundred twenty-four".