43620521 has 16 divisors (see below), whose sum is σ = 54216576. Its totient is φ = 34235136.

The previous prime is 43620481. The next prime is 43620527. The reversal of 43620521 is 12502634.

It is a cyclic number.

It is not a de Polignac number, because 43620521 - 2¹⁴ = 43604137 is a prime.

It is a super-2 number, since 2×43620521² = 3805499704622882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43620527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551 + ... + 9356.

It is an arithmetic number, because the mean of its divisors is an integer number (3388536).

Almost surely, 2^43620521 is an apocalyptic number.

It is an amenable number.

43620521 is a deficient number, since it is larger than the sum of its proper divisors (10596055).

43620521 is a wasteful number, since it uses less digits than its factorization.

43620521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9968.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 43620521 is about 6604.5833328076. The cubic root of 43620521 is about 352.0169827593.

The spelling of 43620521 in words is "forty-three million, six hundred twenty thousand, five hundred twenty-one".