43031604 has 72 divisors (see below), whose sum is σ = 127437408. Its totient is φ = 11175360.

The previous prime is 43031603. The next prime is 43031617. The reversal of 43031604 is 40613034.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43031603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3142 + ... + 9794.

It is an arithmetic number, because the mean of its divisors is an integer number (1769964).

Almost surely, 2^43031604 is an apocalyptic number.

43031604 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43031604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63718704).

43031604 is an abundant number, since it is smaller than the sum of its proper divisors (84405804).

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

43031604 is a wasteful number, since it uses less digits than its factorization.

43031604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685 (or 6676 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 43031604 is about 6559.8478640895. The cubic root of 43031604 is about 350.4256155561.

Adding to 43031604 its reverse (40613034), we get a palindrome (83644638).

The spelling of 43031604 in words is "forty-three million, thirty-one thousand, six hundred four".