43089921 has 16 divisors (see below), whose sum is σ = 72956800. Its totient is φ = 24622704.

The previous prime is 43089899. The next prime is 43089953. The reversal of 43089921 is 12998034.

It is not a de Polignac number, because 43089921 - 2⁵ = 43089889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43085921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113806 + ... + 114183.

It is an arithmetic number, because the mean of its divisors is an integer number (4559800).

It is a Proth number, since it is equal to 1315 ⋅ 2¹⁵ + 1 and 1315 < 2¹⁵.

Almost surely, 2^43089921 is an apocalyptic number.

It is an amenable number.

43089921 is a deficient number, since it is larger than the sum of its proper divisors (29866879).

43089921 is a wasteful number, since it uses less digits than its factorization.

43089921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228005 (or 227999 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 43089921 is about 6564.2913555082. The cubic root of 43089921 is about 350.5838445790.

The spelling of 43089921 in words is "forty-three million, eighty-nine thousand, nine hundred twenty-one".