1098743409 has 24 divisors (see below), whose sum is σ = 1604881512. Its totient is φ = 724308480.

The previous prime is 1098743377. The next prime is 1098743413. The reversal of 1098743409 is 9043478901.

It can be written as a sum of positive squares in 4 ways, for example, as 95121009 + 1003622400 = 9753^2 + 31680^2 .

It is not a de Polignac number, because 1098743409 - 2⁵ = 1098743377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1098743209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 549199 + ... + 551195.

It is an arithmetic number, because the mean of its divisors is an integer number (66870063).

Almost surely, 2^1098743409 is an apocalyptic number.

It is an amenable number.

1098743409 is a deficient number, since it is larger than the sum of its proper divisors (506138103).

1098743409 is a wasteful number, since it uses less digits than its factorization.

1098743409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657 (or 2654 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1098743409 is about 33147.2986682173. The cubic root of 1098743409 is about 1031.8868887433.

The spelling of 1098743409 in words is "one billion, ninety-eight million, seven hundred forty-three thousand, four hundred nine".