43940989 has 4 divisors (see below), whose sum is σ = 43958880. Its totient is φ = 43923100.

The previous prime is 43940983. The next prime is 43940999. The reversal of 43940989 is 98904934.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98904934 = 2 ⋅49452467.

It is a cyclic number.

It is not a de Polignac number, because 43940989 - 2⁷ = 43940861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43940983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4537 + ... + 10414.

It is an arithmetic number, because the mean of its divisors is an integer number (10989720).

Almost surely, 2^43940989 is an apocalyptic number.

It is an amenable number.

43940989 is a deficient number, since it is larger than the sum of its proper divisors (17891).

43940989 is a wasteful number, since it uses less digits than its factorization.

43940989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17890.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 43940989 is about 6628.7999668115. The cubic root of 43940989 is about 352.8769376316.

The spelling of 43940989 in words is "forty-three million, nine hundred forty thousand, nine hundred eighty-nine".