47399621 has 4 divisors (see below), whose sum is σ = 50187852. Its totient is φ = 44611392.

The previous prime is 47399591. The next prime is 47399629. The reversal of 47399621 is 12699374.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26368225 + 21031396 = 5135^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 47399621 - 2¹⁸ = 47137477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47399629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394090 + ... + 1394123.

It is an arithmetic number, because the mean of its divisors is an integer number (12546963).

Almost surely, 2^47399621 is an apocalyptic number.

It is an amenable number.

47399621 is a deficient number, since it is larger than the sum of its proper divisors (2788231).

47399621 is a wasteful number, since it uses less digits than its factorization.

47399621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788230.

The product of its digits is 81648, while the sum is 41.

The square root of 47399621 is about 6884.7382666300. The cubic root of 47399621 is about 361.9025332056.

The spelling of 47399621 in words is "forty-seven million, three hundred ninety-nine thousand, six hundred twenty-one".