43773381 has 6 divisors (see below), whose sum is σ = 63228230. Its totient is φ = 29182248.

The previous prime is 43773377. The next prime is 43773391. The reversal of 43773381 is 18337734.

It can be written as a sum of positive squares in only one way, i.e., 29257281 + 14516100 = 5409^2 + 3810^2 .

It is not a de Polignac number, because 43773381 - 2² = 43773377 is a prime.

It is a super-2 number, since 2×43773381² = 3832217768342322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43773361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2431846 + ... + 2431863.

Almost surely, 2^43773381 is an apocalyptic number.

It is an amenable number.

43773381 is a deficient number, since it is larger than the sum of its proper divisors (19454849).

43773381 is a wasteful number, since it uses less digits than its factorization.

43773381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4863715 (or 4863712 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 43773381 is about 6616.1454790535. The cubic root of 43773381 is about 352.4276960499.

The spelling of 43773381 in words is "forty-three million, seven hundred seventy-three thousand, three hundred eighty-one".