16393939 has 2 divisors, whose sum is σ = 16393940. Its totient is φ = 16393938.

The previous prime is 16393913. The next prime is 16393957. The reversal of 16393939 is 93939361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16393939 - 2¹⁵ = 16361171 is a prime.

It is a super-2 number, since 2×16393939² = 537522471871442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16393895 and 16393904.

It is not a weakly prime, because it can be changed into another prime (16393969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8196969 + 8196970.

It is an arithmetic number, because the mean of its divisors is an integer number (8196970).

Almost surely, 2^16393939 is an apocalyptic number.

16393939 is a deficient number, since it is larger than the sum of its proper divisors (1).

16393939 is an equidigital number, since it uses as much as digits as its factorization.

16393939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 43.

The square root of 16393939 is about 4048.9429484743. The cubic root of 16393939 is about 254.0355159381.

The spelling of 16393939 in words is "sixteen million, three hundred ninety-three thousand, nine hundred thirty-nine".