884991621 has 4 divisors (see below), whose sum is σ = 1179988832. Its totient is φ = 589994412.

The previous prime is 884991577. The next prime is 884991647. The reversal of 884991621 is 126199488.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 884991621 - 2¹⁴ = 884975237 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 (884991691) 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, 147498601 + ... + 147498606.

It is an arithmetic number, because the mean of its divisors is an integer number (294997208).

Almost surely, 2^884991621 is an apocalyptic number.

It is an amenable number.

884991621 is a deficient number, since it is larger than the sum of its proper divisors (294997211).

884991621 is a wasteful number, since it uses less digits than its factorization.

884991621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294997210.

The product of its digits is 248832, while the sum is 48.

The square root of 884991621 is about 29748.8087324518. The cubic root of 884991621 is about 960.0924466094.

The spelling of 884991621 in words is "eight hundred eighty-four million, nine hundred ninety-one thousand, six hundred twenty-one".