44187981 has 8 divisors (see below), whose sum is σ = 62383104. Its totient is φ = 27725760.

The previous prime is 44187919. The next prime is 44188009. The reversal of 44187981 is 18978144.

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

It is not a de Polignac number, because 44187981 - 2⁶ = 44187917 is a prime.

It is a super-2 number, since 2×44187981² = 3905155329712722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44187911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433165 + ... + 433266.

It is an arithmetic number, because the mean of its divisors is an integer number (7797888).

Almost surely, 2^44187981 is an apocalyptic number.

It is an amenable number.

44187981 is a deficient number, since it is larger than the sum of its proper divisors (18195123).

44187981 is a wasteful number, since it uses less digits than its factorization.

44187981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866451.

The product of its digits is 64512, while the sum is 42.

The square root of 44187981 is about 6647.4040797893. The cubic root of 44187981 is about 353.5368756241.

The spelling of 44187981 in words is "forty-four million, one hundred eighty-seven thousand, nine hundred eighty-one".