8662921 has 8 divisors (see below), whose sum is σ = 8967240. Its totient is φ = 8362368.

The previous prime is 8662891. The next prime is 8662939. The reversal of 8662921 is 1292668.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1960000 + 6702921 = 1400^2 + 2589^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8662921 - 2⁵ = 8662889 is a prime.

It is a Duffinian number.

8662921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8662991) 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, 4215 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (1120905).

Almost surely, 2^8662921 is an apocalyptic number.

It is an amenable number.

8662921 is a deficient number, since it is larger than the sum of its proper divisors (304319).

8662921 is a wasteful number, since it uses less digits than its factorization.

8662921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883.

The product of its digits is 10368, while the sum is 34.

The square root of 8662921 is about 2943.2840501725. The cubic root of 8662921 is about 205.3784087409.

The spelling of 8662921 in words is "eight million, six hundred sixty-two thousand, nine hundred twenty-one".