43821037 has 4 divisors (see below), whose sum is σ = 47191900. Its totient is φ = 40450176.

The previous prime is 43821031. The next prime is 43821047. The reversal of 43821037 is 73012834.

It is the 2703-rd star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18610596 + 25210441 = 4314^2 + 5021^2 .

It is a de Polignac number, because none of the positive numbers 2^k-43821037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43820996 and 43821014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43821031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1685412 + ... + 1685437.

It is an arithmetic number, because the mean of its divisors is an integer number (11797975).

Almost surely, 2^43821037 is an apocalyptic number.

It is an amenable number.

43821037 is a deficient number, since it is larger than the sum of its proper divisors (3370863).

43821037 is a wasteful number, since it uses less digits than its factorization.

43821037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370862.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 43821037 is about 6619.7459921057. The cubic root of 43821037 is about 352.5555454612. Note that the first 4 decimals are identical.

The spelling of 43821037 in words is "forty-three million, eight hundred twenty-one thousand, thirty-seven".