4239931 has 2 divisors, whose sum is σ = 4239932. Its totient is φ = 4239930.

The previous prime is 4239923. The next prime is 4239971. The reversal of 4239931 is 1399324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4239931 - 2³ = 4239923 is a prime.

It is a super-2 number, since 2×4239931² = 35954029769522, which contains 22 as substring.

4239931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4239893 and 4239902.

It is not a weakly prime, because it can be changed into another prime (4239971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2119965 + 2119966.

It is an arithmetic number, because the mean of its divisors is an integer number (2119966).

Almost surely, 2^4239931 is an apocalyptic number.

4239931 is a deficient number, since it is larger than the sum of its proper divisors (1).

4239931 is an equidigital number, since it uses as much as digits as its factorization.

4239931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The square root of 4239931 is about 2059.1092734481. The cubic root of 4239931 is about 161.8525687080.

The spelling of 4239931 in words is "four million, two hundred thirty-nine thousand, nine hundred thirty-one".