43697381 has 16 divisors (see below), whose sum is σ = 53937408. Its totient is φ = 34473600.

The previous prime is 43697377. The next prime is 43697389. The reversal of 43697381 is 18379634.

43697381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43697381 - 2² = 43697377 is a prime.

It is a super-2 number, since 2×43697381² = 3818922212518322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43697389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57041 + ... + 57801.

It is an arithmetic number, because the mean of its divisors is an integer number (3371088).

Almost surely, 2^43697381 is an apocalyptic number.

It is an amenable number.

43697381 is a deficient number, since it is larger than the sum of its proper divisors (10240027).

43697381 is a wasteful number, since it uses less digits than its factorization.

43697381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412.

The product of its digits is 108864, while the sum is 41.

The square root of 43697381 is about 6610.3994584291. The cubic root of 43697381 is about 352.2236144789.

The spelling of 43697381 in words is "forty-three million, six hundred ninety-seven thousand, three hundred eighty-one".