16237993 has 2 divisors, whose sum is σ = 16237994. Its totient is φ = 16237992.

The previous prime is 16237979. The next prime is 16237997. The reversal of 16237993 is 39973261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10323369 + 5914624 = 3213^2 + 2432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16237993 is a prime.

It is not a weakly prime, because it can be changed into another prime (16237997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8118996 + 8118997.

It is an arithmetic number, because the mean of its divisors is an integer number (8118997).

Almost surely, 2^16237993 is an apocalyptic number.

It is an amenable number.

16237993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16237993 is an equidigital number, since it uses as much as digits as its factorization.

16237993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 16237993 is about 4029.6393138841. The cubic root of 16237993 is about 253.2274509427.

The spelling of 16237993 in words is "sixteen million, two hundred thirty-seven thousand, nine hundred ninety-three".