44721000 has 96 divisors (see below), whose sum is σ = 151187400. Its totient is φ = 11923200.

The previous prime is 44720969. The next prime is 44721007. The reversal of 44721000 is 12744.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7193124 + 37527876 = 2682^2 + 6126^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (44721007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6516 + ... + 11484.

Almost surely, 2^44721000 is an apocalyptic number.

44721000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 44721000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75593700).

44721000 is an abundant number, since it is smaller than the sum of its proper divisors (106466400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

44721000 is a wasteful number, since it uses less digits than its factorization.

44721000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4996 (or 4979 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 44721000 is about 6687.3761670778. The cubic root of 44721000 is about 354.9527147229.

Adding to 44721000 its reverse (12744), we get a palindrome (44733744).

The spelling of 44721000 in words is "forty-four million, seven hundred twenty-one thousand".