43240987 has 4 divisors (see below), whose sum is σ = 44161056. Its totient is φ = 42320920.

The previous prime is 43240973. The next prime is 43240991. The reversal of 43240987 is 78904234.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78904234 = 2 ⋅39452117.

It is a cyclic number.

It is not a de Polignac number, because 43240987 - 2²³ = 34852379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43240927) 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, 459964 + ... + 460057.

It is an arithmetic number, because the mean of its divisors is an integer number (11040264).

Almost surely, 2^43240987 is an apocalyptic number.

43240987 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

43240987 is a deficient number, since it is larger than the sum of its proper divisors (920069).

43240987 is an equidigital number, since it uses as much as digits as its factorization.

43240987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920068.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 43240987 is about 6575.7879375783. The cubic root of 43240987 is about 350.9930626898.

The spelling of 43240987 in words is "forty-three million, two hundred forty thousand, nine hundred eighty-seven".