39438890 has 16 divisors (see below), whose sum is σ = 72330408. Its totient is φ = 15477696.

The previous prime is 39438863. The next prime is 39438899. The reversal of 39438890 is 9883493.

It can be written as a sum of positive squares in 4 ways, for example, as 35058241 + 4380649 = 5921^2 + 2093^2 .

It is not an unprimeable number, because it can be changed into a prime (39438899) 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, 36677 + ... + 37736.

Almost surely, 2^39438890 is an apocalyptic number.

39438890 is a deficient number, since it is larger than the sum of its proper divisors (32891518).

39438890 is a wasteful number, since it uses less digits than its factorization.

39438890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74473.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 39438890 is about 6280.0390126177. The cubic root of 39438890 is about 340.3885120557.

The spelling of 39438890 in words is "thirty-nine million, four hundred thirty-eight thousand, eight hundred ninety".