53409840 has 80 divisors (see below), whose sum is σ = 180631296. Its totient is φ = 12947200.

The previous prime is 53409823. The next prime is 53409847. The reversal of 53409840 is 4890435.

53409840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×53409840² = 5705222017651200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (53409847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7476 + ... + 12755.

Almost surely, 2^53409840 is an apocalyptic number.

It is an amenable number.

53409840 is an abundant number, since it is smaller than the sum of its proper divisors (127221456).

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

53409840 is a wasteful number, since it uses less digits than its factorization.

53409840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20258 (or 20252 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 53409840 is about 7308.2036096431. The cubic root of 53409840 is about 376.5943143807.

The spelling of 53409840 in words is "fifty-three million, four hundred nine thousand, eight hundred forty".