1392006 has 64 divisors (see below), whose sum is σ = 3649536. Its totient is φ = 343200.

The previous prime is 1391989. The next prime is 1392007. The reversal of 1392006 is 6002931.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10561 + ... + 10691.

It is an arithmetic number, because the mean of its divisors is an integer number (57024).

2^1392006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1392006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824768).

1392006 is an abundant number, since it is smaller than the sum of its proper divisors (2257530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1392006 is a wasteful number, since it uses less digits than its factorization.

1392006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1392006 is about 1179.8330390356. The cubic root of 1392006 is about 111.6555638574.

Adding to 1392006 its reverse (6002931), we get a palindrome (7394937).

It can be divided in two parts, 139 and 2006, that added together give a triangular number (2145 = T₆₅).

The spelling of 1392006 in words is "one million, three hundred ninety-two thousand, six".