40388938 has 8 divisors (see below), whose sum is σ = 62672580. Its totient is φ = 19498080.

The previous prime is 40388899. The next prime is 40388947. The reversal of 40388938 is 83988304.

It can be written as a sum of positive squares in 2 ways, for example, as 38601369 + 1787569 = 6213^2 + 1337^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 40388894 and 40388903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348123 + ... + 348238.

Almost surely, 2^40388938 is an apocalyptic number.

40388938 is a deficient number, since it is larger than the sum of its proper divisors (22283642).

40388938 is a wasteful number, since it uses less digits than its factorization.

40388938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696392.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 40388938 is about 6355.2291854818. The cubic root of 40388938 is about 343.1000736480.

The spelling of 40388938 in words is "forty million, three hundred eighty-eight thousand, nine hundred thirty-eight".