388242266 has 4 divisors (see below), whose sum is σ = 582363402. Its totient is φ = 194121132.

The previous prime is 388242223. The next prime is 388242269. The reversal of 388242266 is 662242883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662242883 = 197 ⋅3361639.

It can be written as a sum of positive squares in only one way, i.e., 212547241 + 175695025 = 14579^2 + 13255^2 .

It is not an unprimeable number, because it can be changed into a prime (388242269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97060565 + ... + 97060568.

Almost surely, 2^388242266 is an apocalyptic number.

388242266 is a deficient number, since it is larger than the sum of its proper divisors (194121136).

388242266 is a wasteful number, since it uses less digits than its factorization.

388242266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194121135.

The product of its digits is 221184, while the sum is 41.

The square root of 388242266 is about 19703.8642402956. The cubic root of 388242266 is about 729.5150754560.

The spelling of 388242266 in words is "three hundred eighty-eight million, two hundred forty-two thousand, two hundred sixty-six".