43989899 has 4 divisors (see below), whose sum is σ = 45408960. Its totient is φ = 42570840.

The previous prime is 43989889. The next prime is 43989901. The reversal of 43989899 is 99898934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99898934 = 2 ⋅49949467.

It is a cyclic number.

It is not a de Polignac number, because 43989899 - 2²⁰ = 42941323 is a prime.

It is a super-2 number, since 2×43989899² = 3870222428060402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43989859) 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, 709484 + ... + 709545.

It is an arithmetic number, because the mean of its divisors is an integer number (11352240).

Almost surely, 2^43989899 is an apocalyptic number.

43989899 is a deficient number, since it is larger than the sum of its proper divisors (1419061).

43989899 is a wasteful number, since it uses less digits than its factorization.

43989899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419060.

The product of its digits is 5038848, while the sum is 59.

The square root of 43989899 is about 6632.4881454851. The cubic root of 43989899 is about 353.0078162768.

The spelling of 43989899 in words is "forty-three million, nine hundred eighty-nine thousand, eight hundred ninety-nine".