403400540 has 12 divisors (see below), whose sum is σ = 847141176. Its totient is φ = 161360208.

The previous prime is 403400539. The next prime is 403400549. The reversal of 403400540 is 45004304.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 20170027 = 403400540 / (4 + 0 + 3 + 4 + 0 + 0 + 5 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403400549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10084994 + ... + 10085033.

It is an arithmetic number, because the mean of its divisors is an integer number (70595098).

Almost surely, 2^403400540 is an apocalyptic number.

It is an amenable number.

403400540 is an abundant number, since it is smaller than the sum of its proper divisors (443740636).

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

403400540 is a wasteful number, since it uses less digits than its factorization.

403400540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20170036 (or 20170034 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 403400540 is about 20084.8335815859. The cubic root of 403400540 is about 738.8883601314. Note that the first 3 decimals are identical.

Adding to 403400540 its reverse (45004304), we get a palindrome (448404844).

The spelling of 403400540 in words is "four hundred three million, four hundred thousand, five hundred forty".