53450040 has 256 divisors, whose sum is σ = 205286400. Its totient is φ = 10838016.

The previous prime is 53450039. The next prime is 53450041. The reversal of 53450040 is 4005435.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (53450039) and next prime (53450041).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 53449989 and 53450016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53450041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 271222 + ... + 271418.

It is an arithmetic number, because the mean of its divisors is an integer number (801900).

Almost surely, 2^53450040 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 53450040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102643200).

53450040 is an abundant number, since it is smaller than the sum of its proper divisors (151836360).

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

53450040 is a wasteful number, since it uses less digits than its factorization.

53450040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 53450040 is about 7310.9534261955. The cubic root of 53450040 is about 376.6887744701.

Adding to 53450040 its reverse (4005435), we get a palindrome (57455475).

The spelling of 53450040 in words is "fifty-three million, four hundred fifty thousand, forty".