53499840 has 112 divisors (see below), whose sum is σ = 177320448. Its totient is φ = 13640704.

The previous prime is 53499739. The next prime is 53499841. The reversal of 53499840 is 4899435.

It is a junction number, because it is equal to n+sod(n) for n = 53499792 and 53499801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53499841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20869 + ... + 23291.

Almost surely, 2^53499840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88660224).

53499840 is an abundant number, since it is smaller than the sum of its proper divisors (123820608).

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

53499840 is a wasteful number, since it uses less digits than its factorization.

53499840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 53499840 is about 7314.3584817809. The cubic root of 53499840 is about 376.8057265370.

The spelling of 53499840 in words is "fifty-three million, four hundred ninety-nine thousand, eight hundred forty".