38400391 has 2 divisors, whose sum is σ = 38400392. Its totient is φ = 38400390.

The previous prime is 38400389. The next prime is 38400403. The reversal of 38400391 is 19300483.

38400391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38400391 - 2¹ = 38400389 is a prime.

Together with 38400389, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38400361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19200195 + 19200196.

It is an arithmetic number, because the mean of its divisors is an integer number (19200196).

Almost surely, 2^38400391 is an apocalyptic number.

38400391 is a deficient number, since it is larger than the sum of its proper divisors (1).

38400391 is an equidigital number, since it uses as much as digits as its factorization.

38400391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 38400391 is about 6196.8049025284. The cubic root of 38400391 is about 337.3742111938.

The spelling of 38400391 in words is "thirty-eight million, four hundred thousand, three hundred ninety-one".