1391066 has 8 divisors (see below), whose sum is σ = 2196480. Its totient is φ = 658908.

The previous prime is 1391057. The next prime is 1391081. The reversal of 1391066 is 6601931.

1391066 = 96² + 97² + ... + 171².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18266 + ... + 18341.

It is an arithmetic number, because the mean of its divisors is an integer number (274560).

2^1391066 is an apocalyptic number.

1391066 is a deficient number, since it is larger than the sum of its proper divisors (805414).

1391066 is a wasteful number, since it uses less digits than its factorization.

1391066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36628.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1391066 is about 1179.4346103112. The cubic root of 1391066 is about 111.6304251094.

Adding to 1391066 its reverse (6601931), we get a palindrome (7992997).

The spelling of 1391066 in words is "one million, three hundred ninety-one thousand, sixty-six".