19903937 has 2 divisors, whose sum is σ = 19903938. Its totient is φ = 19903936.

The previous prime is 19903921. The next prime is 19903951. The reversal of 19903937 is 73930991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 579121 = 4396^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 19903937 - 2⁴ = 19903921 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19903894 and 19903903.

It is not a weakly prime, because it can be changed into another prime (19903967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9951968 + 9951969.

It is an arithmetic number, because the mean of its divisors is an integer number (9951969).

Almost surely, 2^19903937 is an apocalyptic number.

It is an amenable number.

19903937 is a deficient number, since it is larger than the sum of its proper divisors (1).

19903937 is an equidigital number, since it uses as much as digits as its factorization.

19903937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 19903937 is about 4461.3828573661. The cubic root of 19903937 is about 271.0064721611.

The spelling of 19903937 in words is "nineteen million, nine hundred three thousand, nine hundred thirty-seven".