38649393 has 14 divisors (see below), whose sum is σ = 57948674. Its totient is φ = 25765776.

The previous prime is 38649383. The next prime is 38649397. The reversal of 38649393 is 39394683.

It can be written as a sum of positive squares in only one way, i.e., 38229489 + 419904 = 6183^2 + 648^2 .

It is not a de Polignac number, because 38649393 - 2¹⁴ = 38633009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38649397) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 25780 + ... + 27237.

It is an arithmetic number, because the mean of its divisors is an integer number (4139191).

Almost surely, 2^38649393 is an apocalyptic number.

It is an amenable number.

38649393 is a deficient number, since it is larger than the sum of its proper divisors (19299281).

38649393 is an frugal number, since it uses more digits than its factorization.

38649393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53035 (or 53020 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 38649393 is about 6216.8635983106. The cubic root of 38649393 is about 338.1018594072.

Subtracting from 38649393 its product of digits (419904), we obtain a square (38229489 = 6183²).

The spelling of 38649393 in words is "thirty-eight million, six hundred forty-nine thousand, three hundred ninety-three".