43251138 has 64 divisors (see below), whose sum is σ = 113418240. Its totient is φ = 11955600.

The previous prime is 43251137. The next prime is 43251149. The reversal of 43251138 is 83115234.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43251137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9873 + ... + 13563.

It is an arithmetic number, because the mean of its divisors is an integer number (1772160).

Almost surely, 2^43251138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43251138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56709120).

43251138 is an abundant number, since it is smaller than the sum of its proper divisors (70167102).

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

43251138 is a wasteful number, since it uses less digits than its factorization.

43251138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740 (or 3734 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 43251138 is about 6576.5597389517. The cubic root of 43251138 is about 351.0205262304.

The spelling of 43251138 in words is "forty-three million, two hundred fifty-one thousand, one hundred thirty-eight".