38409493 has 2 divisors, whose sum is σ = 38409494. Its totient is φ = 38409492.

The previous prime is 38409487. The next prime is 38409523. The reversal of 38409493 is 39490483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37675044 + 734449 = 6138^2 + 857^2 .

It is an emirp because it is prime and its reverse (39490483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38409493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38409473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19204746 + 19204747.

It is an arithmetic number, because the mean of its divisors is an integer number (19204747).

Almost surely, 2^38409493 is an apocalyptic number.

It is an amenable number.

38409493 is a deficient number, since it is larger than the sum of its proper divisors (1).

38409493 is an equidigital number, since it uses as much as digits as its factorization.

38409493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 38409493 is about 6197.5392697425. The cubic root of 38409493 is about 337.4008648936.

The spelling of 38409493 in words is "thirty-eight million, four hundred nine thousand, four hundred ninety-three".