38406409 has 2 divisors, whose sum is σ = 38406410. Its totient is φ = 38406408.

The previous prime is 38406377. The next prime is 38406457. The reversal of 38406409 is 90460483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38402809 + 3600 = 6197^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 38406409 - 2⁵ = 38406377 is a prime.

It is not a weakly prime, because it can be changed into another prime (38406499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19203204 + 19203205.

It is an arithmetic number, because the mean of its divisors is an integer number (19203205).

Almost surely, 2^38406409 is an apocalyptic number.

It is an amenable number.

38406409 is a deficient number, since it is larger than the sum of its proper divisors (1).

38406409 is an equidigital number, since it uses as much as digits as its factorization.

38406409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 38406409 is about 6197.2904563204. The cubic root of 38406409 is about 337.3918343820.

The spelling of 38406409 in words is "thirty-eight million, four hundred six thousand, four hundred nine".