5402640 has 40 divisors (see below), whose sum is σ = 16748928. Its totient is φ = 1440640.

The previous prime is 5402633. The next prime is 5402647. The reversal of 5402640 is 462045.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (5402633) and next prime (5402647).

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

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (5402647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11016 + ... + 11495.

Almost surely, 2^5402640 is an apocalyptic number.

It is an amenable number.

5402640 is an abundant number, since it is smaller than the sum of its proper divisors (11346288).

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

5402640 is a wasteful number, since it uses less digits than its factorization.

5402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22527 (or 22521 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 5402640 is about 2324.3579758720. The cubic root of 5402640 is about 175.4696500305.

Adding to 5402640 its reverse (462045), we get a palindrome (5864685).

The spelling of 5402640 in words is "five million, four hundred two thousand, six hundred forty".