1491668 has 6 divisors (see below), whose sum is σ = 2610426. Its totient is φ = 745832.

The previous prime is 1491667. The next prime is 1491683. The reversal of 1491668 is 8661941.

It can be written as a sum of positive squares in only one way, i.e., 976144 + 515524 = 988^2 + 718^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186455 + ... + 186462.

It is an arithmetic number, because the mean of its divisors is an integer number (435071).

2^1491668 is an apocalyptic number.

It is an amenable number.

1491668 is a deficient number, since it is larger than the sum of its proper divisors (1118758).

1491668 is a wasteful number, since it uses less digits than its factorization.

1491668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372921 (or 372919 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 1491668 is about 1221.3386098867. The cubic root of 1491668 is about 114.2590804007.

The spelling of 1491668 in words is "one million, four hundred ninety-one thousand, six hundred sixty-eight".