388401089 has 8 divisors (see below), whose sum is σ = 404121960. Its totient is φ = 372835456.

The previous prime is 388401061. The next prime is 388401109. The reversal of 388401089 is 980104883.

It can be written as a sum of positive squares in 4 ways, for example, as 136702864 + 251698225 = 11692^2 + 15865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 388401089 - 2¹⁶ = 388335553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (388401389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33692 + ... + 43725.

It is an arithmetic number, because the mean of its divisors is an integer number (50515245).

Almost surely, 2^388401089 is an apocalyptic number.

It is an amenable number.

388401089 is a deficient number, since it is larger than the sum of its proper divisors (15720871).

388401089 is a wasteful number, since it uses less digits than its factorization.

388401089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77619.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 388401089 is about 19707.8940782621. The cubic root of 388401089 is about 729.6145391048.

The spelling of 388401089 in words is "three hundred eighty-eight million, four hundred one thousand, eighty-nine".