388981069 has 4 divisors (see below), whose sum is σ = 393904960. Its totient is φ = 384057180.

The previous prime is 388981049. The next prime is 388981123. The reversal of 388981069 is 960189883.

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 not a de Polignac number, because 388981069 - 2¹⁹ = 388456781 is a prime.

It is a super-2 number, since 2×388981069² = 302612544080765522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388981009) 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, 2461827 + ... + 2461984.

It is an arithmetic number, because the mean of its divisors is an integer number (98476240).

Almost surely, 2^388981069 is an apocalyptic number.

It is an amenable number.

388981069 is a deficient number, since it is larger than the sum of its proper divisors (4923891).

388981069 is an equidigital number, since it uses as much as digits as its factorization.

388981069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923890.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 388981069 is about 19722.6029975762. The cubic root of 388981069 is about 729.9775241720.

The spelling of 388981069 in words is "three hundred eighty-eight million, nine hundred eighty-one thousand, sixty-nine".