38990909 has 2 divisors, whose sum is σ = 38990910. Its totient is φ = 38990908.

The previous prime is 38990899. The next prime is 38990951. The reversal of 38990909 is 90909983.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 10582009 = 5330^2 + 3253^2 .

It is a cyclic number.

It is not a de Polignac number, because 38990909 - 2¹² = 38986813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38990009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19495454 + 19495455.

It is an arithmetic number, because the mean of its divisors is an integer number (19495455).

Almost surely, 2^38990909 is an apocalyptic number.

It is an amenable number.

38990909 is a deficient number, since it is larger than the sum of its proper divisors (1).

38990909 is an equidigital number, since it uses as much as digits as its factorization.

38990909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 38990909 is about 6244.2700934537. The cubic root of 38990909 is about 339.0947922510.

The spelling of 38990909 in words is "thirty-eight million, nine hundred ninety thousand, nine hundred nine".