1400403440 has 40 divisors (see below), whose sum is σ = 3257553408. Its totient is φ = 559883520.

The previous prime is 1400403439. The next prime is 1400403443. The reversal of 1400403440 is 443040041.

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

It is a super-2 number, since 2×1400403440² = 3922259589527667200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400403443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251729 + ... + 257231.

Almost surely, 2^1400403440 is an apocalyptic number.

1400403440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1400403440 is an abundant number, since it is smaller than the sum of its proper divisors (1857149968).

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

1400403440 is a wasteful number, since it uses less digits than its factorization.

1400403440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8697 (or 8691 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1400403440 is about 37421.9646731702. The cubic root of 1400403440 is about 1118.7963898245.

Adding to 1400403440 its reverse (443040041), we get a palindrome (1843443481).

The spelling of 1400403440 in words is "one billion, four hundred million, four hundred three thousand, four hundred forty".