43253981 has 8 divisors (see below), whose sum is σ = 44064000. Its totient is φ = 42449680.

The previous prime is 43253929. The next prime is 43253983. The reversal of 43253981 is 18935234.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43253981 - 2²² = 39059677 is a prime.

It is a super-2 number, since 2×43253981² = 3741813744696722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43253983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15695 + ... + 18243.

It is an arithmetic number, because the mean of its divisors is an integer number (5508000).

Almost surely, 2^43253981 is an apocalyptic number.

It is an amenable number.

43253981 is a deficient number, since it is larger than the sum of its proper divisors (810019).

43253981 is a wasteful number, since it uses less digits than its factorization.

43253981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859.

The product of its digits is 25920, while the sum is 35.

The square root of 43253981 is about 6576.7758818436. The cubic root of 43253981 is about 351.0282171994.

The spelling of 43253981 in words is "forty-three million, two hundred fifty-three thousand, nine hundred eighty-one".