1406640 has 40 divisors (see below), whose sum is σ = 4361328. Its totient is φ = 375040.

The previous prime is 1406633. The next prime is 1406651. The reversal of 1406640 is 466041.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2691 + ... + 3170.

2^1406640 is an apocalyptic number.

1406640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1406640 is an abundant number, since it is smaller than the sum of its proper divisors (2954688).

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

1406640 is a wasteful number, since it uses less digits than its factorization.

1406640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5877 (or 5871 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1406640 is about 1186.0185496020. The cubic root of 1406640 is about 112.0454747309.

The spelling of 1406640 in words is "one million, four hundred six thousand, six hundred forty".