1098423959 has 2 divisors, whose sum is σ = 1098423960. Its totient is φ = 1098423958.

The previous prime is 1098423947. The next prime is 1098423973. The reversal of 1098423959 is 9593248901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098423959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098428959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549211979 + 549211980.

It is an arithmetic number, because the mean of its divisors is an integer number (549211980).

Almost surely, 2^1098423959 is an apocalyptic number.

1098423959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098423959 is an equidigital number, since it uses as much as digits as its factorization.

1098423959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 1098423959 is about 33142.4796748825. The cubic root of 1098423959 is about 1031.7868750320.

It can be divided in two parts, 10984 and 23959, that added together give a palindrome (34943).

The spelling of 1098423959 in words is "one billion, ninety-eight million, four hundred twenty-three thousand, nine hundred fifty-nine".