1400840 has 32 divisors (see below), whose sum is σ = 3602880. Its totient is φ = 480192.

The previous prime is 1400821. The next prime is 1400863. The reversal of 1400840 is 480041.

It is a happy number.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2222 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (112590).

2^1400840 is an apocalyptic number.

1400840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1400840 is an abundant number, since it is smaller than the sum of its proper divisors (2202040).

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

1400840 is a wasteful number, since it uses less digits than its factorization.

1400840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1400840 is about 1183.5708681782. The cubic root of 1400840 is about 111.8912635137.

Adding to 1400840 its reverse (480041), we get a palindrome (1880881).

The spelling of 1400840 in words is "one million, four hundred thousand, eight hundred forty".