1289432098 has 4 divisors (see below), whose sum is σ = 1934148150. Its totient is φ = 644716048.

The previous prime is 1289432087. The next prime is 1289432107. The reversal of 1289432098 is 8902349821.

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

It can be written as a sum of positive squares in only one way, i.e., 722373129 + 567058969 = 26877^2 + 23813^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322358023 + ... + 322358026.

Almost surely, 2^1289432098 is an apocalyptic number.

1289432098 is a deficient number, since it is larger than the sum of its proper divisors (644716052).

1289432098 is an equidigital number, since it uses as much as digits as its factorization.

1289432098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644716051.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1289432098 is about 35908.6632722523. The cubic root of 1289432098 is about 1088.4274655955.

The spelling of 1289432098 in words is "one billion, two hundred eighty-nine million, four hundred thirty-two thousand, ninety-eight".