39778938 has 80 divisors (see below), whose sum is σ = 93854376. Its totient is φ = 12579840.

The previous prime is 39778927. The next prime is 39778969. The reversal of 39778938 is 83987793.

It can be written as a sum of positive squares in 4 ways, for example, as 15896169 + 23882769 = 3987^2 + 4887^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 351970 + ... + 352082.

Almost surely, 2^39778938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39778938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46927188).

39778938 is an abundant number, since it is smaller than the sum of its proper divisors (54075438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39778938 is a wasteful number, since it uses less digits than its factorization.

39778938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 212 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 39778938 is about 6307.0546216122. The cubic root of 39778938 is about 341.3640073125.

The spelling of 39778938 in words is "thirty-nine million, seven hundred seventy-eight thousand, nine hundred thirty-eight".