388406407 has 4 divisors (see below), whose sum is σ = 397879776. Its totient is φ = 378933040.

The previous prime is 388406383. The next prime is 388406411. The reversal of 388406407 is 704604883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704604883 = 22973 ⋅30671.

It is a cyclic number.

It is not a de Polignac number, because 388406407 - 2¹⁵ = 388373639 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 388406407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388407407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736623 + ... + 4736704.

It is an arithmetic number, because the mean of its divisors is an integer number (99469944).

Almost surely, 2^388406407 is an apocalyptic number.

388406407 is a deficient number, since it is larger than the sum of its proper divisors (9473369).

388406407 is an equidigital number, since it uses as much as digits as its factorization.

388406407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473368.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 388406407 is about 19708.0289983550. The cubic root of 388406407 is about 729.6178690581.

The spelling of 388406407 in words is "three hundred eighty-eight million, four hundred six thousand, four hundred seven".