6921239 has 4 divisors (see below), whose sum is σ = 7453656. Its totient is φ = 6388824.

The previous prime is 6921223. The next prime is 6921247. The reversal of 6921239 is 9321296.

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

It is not a de Polignac number, because 6921239 - 2⁴ = 6921223 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 (6921209) 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, 266189 + ... + 266214.

It is an arithmetic number, because the mean of its divisors is an integer number (1863414).

Almost surely, 2^6921239 is an apocalyptic number.

6921239 is a deficient number, since it is larger than the sum of its proper divisors (532417).

6921239 is a wasteful number, since it uses less digits than its factorization.

6921239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532416.

The product of its digits is 5832, while the sum is 32.

The square root of 6921239 is about 2630.8247756170. The cubic root of 6921239 is about 190.5729611244.

The spelling of 6921239 in words is "six million, nine hundred twenty-one thousand, two hundred thirty-nine".