39954393 has 6 divisors (see below), whose sum is σ = 57711914. Its totient is φ = 26636256.

The previous prime is 39954391. The next prime is 39954401. The reversal of 39954393 is 39345993.

It can be written as a sum of positive squares in only one way, i.e., 32353344 + 7601049 = 5688^2 + 2757^2 .

It is not a de Polignac number, because 39954393 - 2¹ = 39954391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39954391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2219680 + ... + 2219697.

Almost surely, 2^39954393 is an apocalyptic number.

It is an amenable number.

39954393 is a deficient number, since it is larger than the sum of its proper divisors (17757521).

39954393 is a wasteful number, since it uses less digits than its factorization.

39954393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439383 (or 4439380 counting only the distinct ones).

The product of its digits is 393660, while the sum is 45.

The square root of 39954393 is about 6320.9487420798. The cubic root of 39954393 is about 341.8651617831.

Subtracting from 39954393 its reverse (39345993), we obtain a square (608400 = 780²).

The spelling of 39954393 in words is "thirty-nine million, nine hundred fifty-four thousand, three hundred ninety-three".