1400440 has 32 divisors (see below), whose sum is σ = 3185280. Its totient is φ = 554112.

The previous prime is 1400423. The next prime is 1400449. The reversal of 1400440 is 440041.

It is a happy number.

It is a super-2 number, since 2×1400440² = 3922464387200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1400440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400449) 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, 6169 + ... + 6391.

It is an arithmetic number, because the mean of its divisors is an integer number (99540).

2^1400440 is an apocalyptic number.

1400440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1400440 is an abundant number, since it is smaller than the sum of its proper divisors (1784840).

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

1400440 is a wasteful number, since it uses less digits than its factorization.

1400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1400440 is about 1183.4018759492. The cubic root of 1400440 is about 111.8806125790.

Adding to 1400440 its reverse (440041), we get a palindrome (1840481).

The spelling of 1400440 in words is "one million, four hundred thousand, four hundred forty".