1098723849 has 16 divisors (see below), whose sum is σ = 1548705600. Its totient is φ = 690944256.

The previous prime is 1098723827. The next prime is 1098723853. The reversal of 1098723849 is 9483278901.

It is not a de Polignac number, because 1098723849 - 2⁵ = 1098723817 is a prime.

It is a super-2 number, since 2×1098723849² = 2414388192722749602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1098723809) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 28084 + ... + 54645.

It is an arithmetic number, because the mean of its divisors is an integer number (96794100).

Almost surely, 2^1098723849 is an apocalyptic number.

1098723849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1098723849 is a deficient number, since it is larger than the sum of its proper divisors (449981751).

1098723849 is a wasteful number, since it uses less digits than its factorization.

1098723849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82984.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 1098723849 is about 33147.0036202369. The cubic root of 1098723849 is about 1031.8807654370.

The spelling of 1098723849 in words is "one billion, ninety-eight million, seven hundred twenty-three thousand, eight hundred forty-nine".