6239921 has 2 divisors, whose sum is σ = 6239922. Its totient is φ = 6239920.

The previous prime is 6239887. The next prime is 6239927. The reversal of 6239921 is 1299326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3312400 + 2927521 = 1820^2 + 1711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6239921 is a prime.

It is a super-2 number, since 2×6239921² = 77873228172482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6239927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3119960 + 3119961.

It is an arithmetic number, because the mean of its divisors is an integer number (3119961).

Almost surely, 2^6239921 is an apocalyptic number.

It is an amenable number.

6239921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6239921 is an equidigital number, since it uses as much as digits as its factorization.

6239921 is an evil number, because the sum of its binary digits is even.

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

The square root of 6239921 is about 2497.9833866541. The cubic root of 6239921 is about 184.1025047155.

The spelling of 6239921 in words is "six million, two hundred thirty-nine thousand, nine hundred twenty-one".