1408240 has 40 divisors (see below), whose sum is σ = 3392640. Its totient is φ = 542976.

The previous prime is 1408219. The next prime is 1408241. The reversal of 1408240 is 428041.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1408241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2017 + ... + 2623.

It is an arithmetic number, because the mean of its divisors is an integer number (84816).

2^1408240 is an apocalyptic number.

1408240 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 1408240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696320).

1408240 is an abundant number, since it is smaller than the sum of its proper divisors (1984400).

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

1408240 is a wasteful number, since it uses less digits than its factorization.

1408240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1408240 is about 1186.6928836055. The cubic root of 1408240 is about 112.0879411356.

The spelling of 1408240 in words is "one million, four hundred eight thousand, two hundred forty".