43278138 has 40 divisors (see below), whose sum is σ = 97400160. Its totient is φ = 14362920.

The previous prime is 43278133. The next prime is 43278223. The reversal of 43278138 is 83187234.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43278133) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49953 + ... + 50811.

It is an arithmetic number, because the mean of its divisors is an integer number (2435004).

Almost surely, 2^43278138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43278138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48700080).

43278138 is an abundant number, since it is smaller than the sum of its proper divisors (54122022).

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

43278138 is a wasteful number, since it uses less digits than its factorization.

43278138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1175 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 43278138 is about 6578.6121636710. The cubic root of 43278138 is about 351.0935538483.

The spelling of 43278138 in words is "forty-three million, two hundred seventy-eight thousand, one hundred thirty-eight".