1407840 has 96 divisors (see below), whose sum is σ = 5080320. Its totient is φ = 321024.

The previous prime is 1407829. The next prime is 1407841. The reversal of 1407840 is 487041.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1407840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1407841) 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 15 ways as a sum of consecutive naturals, for example, 3151 + ... + 3569.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2^1407840 is an apocalyptic number.

1407840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1407840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540160).

1407840 is an abundant number, since it is smaller than the sum of its proper divisors (3672480).

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

1407840 is a wasteful number, since it uses less digits than its factorization.

1407840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1407840 is about 1186.5243360336. The cubic root of 1407840 is about 112.0773275513.

The spelling of 1407840 in words is "one million, four hundred seven thousand, eight hundred forty".