1381666 has 16 divisors (see below), whose sum is σ = 2435328. Its totient is φ = 579600.

The previous prime is 1381649. The next prime is 1381693. The reversal of 1381666 is 6661831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2130 + ... + 2701.

It is an arithmetic number, because the mean of its divisors is an integer number (152208).

2^1381666 is an apocalyptic number.

1381666 is a deficient number, since it is larger than the sum of its proper divisors (1053662).

1381666 is a wasteful number, since it uses less digits than its factorization.

1381666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857.

The product of its digits is 5184, while the sum is 31.

The square root of 1381666 is about 1175.4428952527. The cubic root of 1381666 is about 111.3784125081.

The spelling of 1381666 in words is "one million, three hundred eighty-one thousand, six hundred sixty-six".