1400040 has 48 divisors (see below), whose sum is σ = 4551300. Its totient is φ = 373248.

The previous prime is 1400039. The next prime is 1400051. The reversal of 1400040 is 400041.

It can be written as a sum of positive squares in 2 ways, for example, as 1397124 + 2916 = 1182^2 + 54^2 .

It is a super-2 number, since 2×1400040² = 3920224003200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 1399995 and 1400031.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1585 + ... + 2304.

2^1400040 is an apocalyptic number.

1400040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1400040 is an abundant number, since it is smaller than the sum of its proper divisors (3151260).

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

1400040 is a wasteful number, since it uses less digits than its factorization.

1400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906 (or 3899 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 1400040 is about 1183.2328595843. The cubic root of 1400040 is about 111.8699596160.

Adding to 1400040 its reverse (400041), we get a palindrome (1800081).

Subtracting from 1400040 its reverse (400041), we obtain a palindrome (999999).

The spelling of 1400040 in words is "one million, four hundred thousand, forty".