44687989 has 2 divisors, whose sum is σ = 44687990. Its totient is φ = 44687988.

The previous prime is 44687987. The next prime is 44687999. The reversal of 44687989 is 98978644.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43125489 + 1562500 = 6567^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 44687989 - 2¹ = 44687987 is a prime.

Together with 44687987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44687987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22343994 + 22343995.

It is an arithmetic number, because the mean of its divisors is an integer number (22343995).

Almost surely, 2^44687989 is an apocalyptic number.

It is an amenable number.

44687989 is a deficient number, since it is larger than the sum of its proper divisors (1).

44687989 is an equidigital number, since it uses as much as digits as its factorization.

44687989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 55.

The square root of 44687989 is about 6684.9075535867. The cubic root of 44687989 is about 354.8653565965.

The spelling of 44687989 in words is "forty-four million, six hundred eighty-seven thousand, nine hundred eighty-nine".