1098391078 has 4 divisors (see below), whose sum is σ = 1647586620. Its totient is φ = 549195538.

The previous prime is 1098391067. The next prime is 1098391093. The reversal of 1098391078 is 8701938901.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 274597768 + ... + 274597771.

It is an arithmetic number, because the mean of its divisors is an integer number (411896655).

Almost surely, 2^1098391078 is an apocalyptic number.

1098391078 is a deficient number, since it is larger than the sum of its proper divisors (549195542).

1098391078 is an equidigital number, since it uses as much as digits as its factorization.

1098391078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549195541.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1098391078 is about 33141.9836159515. The cubic root of 1098391078 is about 1031.7765795165.

The spelling of 1098391078 in words is "one billion, ninety-eight million, three hundred ninety-one thousand, seventy-eight".