388742947 has 4 divisors (see below), whose sum is σ = 388984680. Its totient is φ = 388501216.

The previous prime is 388742903. The next prime is 388742957. The reversal of 388742947 is 749247883.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 388742947 - 2⁷ = 388742819 is a prime.

It is a super-2 number, since 2×388742947² = 302242157684489618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 388742894 and 388742903.

It is not an unprimeable number, because it can be changed into a prime (388742957) 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, 118438 + ... + 121675.

It is an arithmetic number, because the mean of its divisors is an integer number (97246170).

Almost surely, 2^388742947 is an apocalyptic number.

388742947 is a deficient number, since it is larger than the sum of its proper divisors (241733).

388742947 is a wasteful number, since it uses less digits than its factorization.

388742947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241732.

The product of its digits is 2709504, while the sum is 52.

The square root of 388742947 is about 19716.5652941885. The cubic root of 388742947 is about 729.8285373242.

The spelling of 388742947 in words is "three hundred eighty-eight million, seven hundred forty-two thousand, nine hundred forty-seven".