1289898432 has 98 divisors (see below), whose sum is σ = 3837846528. Its totient is φ = 429950592.

The previous prime is 1289898431. The next prime is 1289898457. The reversal of 1289898432 is 2348989821.

1289898432 is a `hidden beast` number, since 128 + 9 + 89 + 8 + 432 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289898431) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 32833 + ... + 60479.

Almost surely, 2^1289898432 is an apocalyptic number.

1289898432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289898432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918923264).

1289898432 is an abundant number, since it is smaller than the sum of its proper divisors (2547948096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289898432 is an frugal number, since it uses more digits than its factorization.

1289898432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27677 (or 27652 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 1289898432 is about 35915.1560208222. The cubic root of 1289898432 is about 1088.5586627733.

The spelling of 1289898432 in words is "one billion, two hundred eighty-nine million, eight hundred ninety-eight thousand, four hundred thirty-two".