43969381 has 4 divisors (see below), whose sum is σ = 44215200. Its totient is φ = 43723564.

The previous prime is 43969369. The next prime is 43969391. The reversal of 43969381 is 18396934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43969381 - 2¹³ = 43961189 is a prime.

It is a super-2 number, since 2×43969381² = 3866612931046322, 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 (43969391) 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, 122641 + ... + 122998.

It is an arithmetic number, because the mean of its divisors is an integer number (11053800).

Almost surely, 2^43969381 is an apocalyptic number.

It is an amenable number.

43969381 is a deficient number, since it is larger than the sum of its proper divisors (245819).

43969381 is a wasteful number, since it uses less digits than its factorization.

43969381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245818.

The product of its digits is 139968, while the sum is 43.

The square root of 43969381 is about 6630.9411850807. The cubic root of 43969381 is about 352.9529238209.

The spelling of 43969381 in words is "forty-three million, nine hundred sixty-nine thousand, three hundred eighty-one".