921247 has 8 divisors (see below), whose sum is σ = 997056. Its totient is φ = 847872.

The previous prime is 921241. The next prime is 921257. The reversal of 921247 is 742129.

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 921247 - 2¹⁵ = 888479 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 (921241) 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, 223 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (124632).

2⁹²¹²⁴⁷ is an apocalyptic number.

921247 is a deficient number, since it is larger than the sum of its proper divisors (75809).

921247 is a wasteful number, since it uses less digits than its factorization.

921247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217.

The product of its digits is 1008, while the sum is 25.

The square root of 921247 is about 959.8161282246. The cubic root of 921247 is about 97.3028054738.

It can be divided in two parts, 9212 and 47, that multiplied together give a square (432964 = 658²).

The spelling of 921247 in words is "nine hundred twenty-one thousand, two hundred forty-seven".