38644642 has 8 divisors (see below), whose sum is σ = 58499100. Its totient is φ = 19144944.

The previous prime is 38644633. The next prime is 38644699. The reversal of 38644642 is 24644683.

38644642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 38576521 + 68121 = 6211^2 + 261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88417 + ... + 88852.

Almost surely, 2^38644642 is an apocalyptic number.

38644642 is a deficient number, since it is larger than the sum of its proper divisors (19854458).

38644642 is a wasteful number, since it uses less digits than its factorization.

38644642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177380.

The product of its digits is 110592, while the sum is 37.

The square root of 38644642 is about 6216.4814807092. The cubic root of 38644642 is about 338.0880050477.

It can be divided in two parts, 38 and 644642, that added together give a triangular number (644680 = T₁₁₃₅).

The spelling of 38644642 in words is "thirty-eight million, six hundred forty-four thousand, six hundred forty-two".