388438129 has 4 divisors (see below), whose sum is σ = 390279280. Its totient is φ = 386596980.

The previous prime is 388438103. The next prime is 388438133. The reversal of 388438129 is 921834883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388438129 is a prime.

It is a super-2 number, since 2×388438129² = 301768360122041282, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 388438129 parts by 27872 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388438189) 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, 920259 + ... + 920680.

It is an arithmetic number, because the mean of its divisors is an integer number (97569820).

Almost surely, 2^388438129 is an apocalyptic number.

It is an amenable number.

388438129 is a deficient number, since it is larger than the sum of its proper divisors (1841151).

388438129 is a wasteful number, since it uses less digits than its factorization.

388438129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841150.

The product of its digits is 331776, while the sum is 46.

The square root of 388438129 is about 19708.8337808202. The cubic root of 388438129 is about 729.6377316792.

The spelling of 388438129 in words is "three hundred eighty-eight million, four hundred thirty-eight thousand, one hundred twenty-nine".