1406688 has 24 divisors (see below), whose sum is σ = 3692808. Its totient is φ = 468864.

The previous prime is 1406683. The next prime is 1406689. The reversal of 1406688 is 8866041.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1406688² = 3957542258688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406683) 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 3 ways as a sum of consecutive naturals, for example, 7231 + ... + 7422.

It is an arithmetic number, because the mean of its divisors is an integer number (153867).

2^1406688 is an apocalyptic number.

It is an amenable number.

1406688 is an abundant number, since it is smaller than the sum of its proper divisors (2286120).

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

1406688 is a wasteful number, since it uses less digits than its factorization.

1406688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14666 (or 14658 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 1406688 is about 1186.0387852006. The cubic root of 1406688 is about 112.0467491915.

The spelling of 1406688 in words is "one million, four hundred six thousand, six hundred eighty-eight".