44721989 has 4 divisors (see below), whose sum is σ = 48162156. Its totient is φ = 41281824.

The previous prime is 44721961. The next prime is 44721997. The reversal of 44721989 is 98912744.

44721989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10029889 + 34692100 = 3167^2 + 5890^2 .

It is a cyclic number.

It is not a de Polignac number, because 44721989 - 2²⁴ = 27944773 is a prime.

It is a super-2 number, since 2×44721989² = 4000112600232242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44721949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1720064 + ... + 1720089.

It is an arithmetic number, because the mean of its divisors is an integer number (12040539).

Almost surely, 2^44721989 is an apocalyptic number.

It is an amenable number.

44721989 is a deficient number, since it is larger than the sum of its proper divisors (3440167).

44721989 is a wasteful number, since it uses less digits than its factorization.

44721989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440166.

The product of its digits is 145152, while the sum is 44.

The square root of 44721989 is about 6687.4501119635. The cubic root of 44721989 is about 354.9553312837.

The spelling of 44721989 in words is "forty-four million, seven hundred twenty-one thousand, nine hundred eighty-nine".