43631421 has 8 divisors (see below), whose sum is σ = 59594304. Its totient is φ = 28378080.

The previous prime is 43631381. The next prime is 43631459. The reversal of 43631421 is 12413634.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43631421 - 2¹¹ = 43629373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43631391 and 43631400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43631461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177241 + ... + 177486.

It is an arithmetic number, because the mean of its divisors is an integer number (7449288).

Almost surely, 2^43631421 is an apocalyptic number.

43631421 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

43631421 is a deficient number, since it is larger than the sum of its proper divisors (15962883).

43631421 is a wasteful number, since it uses less digits than its factorization.

43631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354771.

The product of its digits is 1728, while the sum is 24.

The square root of 43631421 is about 6605.4084657953. The cubic root of 43631421 is about 352.0463012656.

The spelling of 43631421 in words is "forty-three million, six hundred thirty-one thousand, four hundred twenty-one".