1098985447 has 4 divisors (see below), whose sum is σ = 1255983376. Its totient is φ = 941987520.

The previous prime is 1098985387. The next prime is 1098985453. The reversal of 1098985447 is 7445898901.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098985447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098985477) 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, 78498954 + ... + 78498967.

It is an arithmetic number, because the mean of its divisors is an integer number (313995844).

Almost surely, 2^1098985447 is an apocalyptic number.

1098985447 is a deficient number, since it is larger than the sum of its proper divisors (156997929).

1098985447 is an equidigital number, since it uses as much as digits as its factorization.

1098985447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156997928.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The square root of 1098985447 is about 33150.9494132521. The cubic root of 1098985447 is about 1031.9626533242.

The spelling of 1098985447 in words is "one billion, ninety-eight million, nine hundred eighty-five thousand, four hundred forty-seven".