38393890 has 16 divisors (see below), whose sum is σ = 69511608. Its totient is φ = 15268096.

The previous prime is 38393867. The next prime is 38393893. The reversal of 38393890 is 9839383.

It can be written as a sum of positive squares in 4 ways, for example, as 38278969 + 114921 = 6187^2 + 339^2 .

It is not an unprimeable number, because it can be changed into a prime (38393893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9367 + ... + 12826.

Almost surely, 2^38393890 is an apocalyptic number.

38393890 is a deficient number, since it is larger than the sum of its proper divisors (31117718).

38393890 is a wasteful number, since it uses less digits than its factorization.

38393890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22373.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 38393890 is about 6196.2803358144. The cubic root of 38393890 is about 337.3551715133.

The spelling of 38393890 in words is "thirty-eight million, three hundred ninety-three thousand, eight hundred ninety".