1406840 has 16 divisors (see below), whose sum is σ = 3165480. Its totient is φ = 562720.

The previous prime is 1406837. The next prime is 1406849. The reversal of 1406840 is 486041.

It is a happy number.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17546 + ... + 17625.

2^1406840 is an apocalyptic number.

1406840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1406840 is an abundant number, since it is smaller than the sum of its proper divisors (1758640).

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

1406840 is a wasteful number, since it uses less digits than its factorization.

1406840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35182 (or 35178 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1406840 is about 1186.1028623184. The cubic root of 1406840 is about 112.0507847920.

The spelling of 1406840 in words is "one million, four hundred six thousand, eight hundred forty".