388729642 has 24 divisors (see below), whose sum is σ = 689800320. Its totient is φ = 163772280.

The previous prime is 388729639. The next prime is 388729669. The reversal of 388729642 is 246927883.

It is a super-2 number, since 2×388729642² = 302221469138896328, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27834 + ... + 39397.

It is an arithmetic number, because the mean of its divisors is an integer number (28741680).

Almost surely, 2^388729642 is an apocalyptic number.

388729642 is a deficient number, since it is larger than the sum of its proper divisors (301070678).

388729642 is a wasteful number, since it uses less digits than its factorization.

388729642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67306 (or 67299 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 388729642 is about 19716.2278846639. The cubic root of 388729642 is about 729.8202109314.

The spelling of 388729642 in words is "three hundred eighty-eight million, seven hundred twenty-nine thousand, six hundred forty-two".