43721998 has 8 divisors (see below), whose sum is σ = 65945880. Its totient is φ = 21740040.

The previous prime is 43721987. The next prime is 43721999. The reversal of 43721998 is 89912734.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×43721998² = 3823226218224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43721999) 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, 60028 + ... + 60751.

It is an arithmetic number, because the mean of its divisors is an integer number (8243235).

Almost surely, 2^43721998 is an apocalyptic number.

43721998 is a deficient number, since it is larger than the sum of its proper divisors (22223882).

43721998 is a wasteful number, since it uses less digits than its factorization.

43721998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120962.

The product of its digits is 108864, while the sum is 43.

The square root of 43721998 is about 6612.2611866139. The cubic root of 43721998 is about 352.2897440029.

The spelling of 43721998 in words is "forty-three million, seven hundred twenty-one thousand, nine hundred ninety-eight".