388707881 has 2 divisors, whose sum is σ = 388707882. Its totient is φ = 388707880.

The previous prime is 388707877. The next prime is 388707899. The reversal of 388707881 is 188707883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383376400 + 5331481 = 19580^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 388707881 - 2² = 388707877 is a prime.

It is a super-2 number, since 2×388707881² = 302187633503020322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388707821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194353940 + 194353941.

It is an arithmetic number, because the mean of its divisors is an integer number (194353941).

Almost surely, 2^388707881 is an apocalyptic number.

It is an amenable number.

388707881 is a deficient number, since it is larger than the sum of its proper divisors (1).

388707881 is an equidigital number, since it uses as much as digits as its factorization.

388707881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 50.

The square root of 388707881 is about 19715.6760218867. The cubic root of 388707881 is about 729.8065922855.

The spelling of 388707881 in words is "three hundred eighty-eight million, seven hundred seven thousand, eight hundred eighty-one".