43998407 has 4 divisors (see below), whose sum is σ = 44425680. Its totient is φ = 43571136.

The previous prime is 43998391. The next prime is 43998419. The reversal of 43998407 is 70489934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70489934 = 2 ⋅35244967.

It is a cyclic number.

It is not a de Polignac number, because 43998407 - 2⁴ = 43998391 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 (43998467) 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, 213482 + ... + 213687.

It is an arithmetic number, because the mean of its divisors is an integer number (11106420).

Almost surely, 2^43998407 is an apocalyptic number.

43998407 is a deficient number, since it is larger than the sum of its proper divisors (427273).

43998407 is a wasteful number, since it uses less digits than its factorization.

43998407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427272.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 43998407 is about 6633.1295027310. The cubic root of 43998407 is about 353.0305729926.

The spelling of 43998407 in words is "forty-three million, nine hundred ninety-eight thousand, four hundred seven".