53406621 has 40 divisors (see below), whose sum is σ = 84332160. Its totient is φ = 33615648.

The previous prime is 53406611. The next prime is 53406649. The reversal of 53406621 is 12660435.

53406621 is a `hidden beast` number, since 5 + 34 + 0 + 6 + 621 = 666.

It is not a de Polignac number, because 53406621 - 2⁶ = 53406557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53406611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 202936 + ... + 203198.

It is an arithmetic number, because the mean of its divisors is an integer number (2108304).

Almost surely, 2^53406621 is an apocalyptic number.

It is an amenable number.

53406621 is a deficient number, since it is larger than the sum of its proper divisors (30925539).

53406621 is a wasteful number, since it uses less digits than its factorization.

53406621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 53406621 is about 7307.9833743653. The cubic root of 53406621 is about 376.5867484749.

The spelling of 53406621 in words is "fifty-three million, four hundred six thousand, six hundred twenty-one".