1289461420 has 96 divisors (see below), whose sum is σ = 3056320512. Its totient is φ = 453412608.

The previous prime is 1289461379. The next prime is 1289461447. The reversal of 1289461420 is 241649821.

It is a self number, because there is not a number n which added to its sum of digits gives 1289461420.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2290059 + ... + 2290621.

It is an arithmetic number, because the mean of its divisors is an integer number (31836672).

Almost surely, 2^1289461420 is an apocalyptic number.

1289461420 is a gapful number since it is divisible by the number (10) 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 1289461420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1528160256).

1289461420 is an abundant number, since it is smaller than the sum of its proper divisors (1766859092).

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

1289461420 is a wasteful number, since it uses less digits than its factorization.

1289461420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1289461420 is about 35909.0715558061. The cubic root of 1289461420 is about 1088.4357159015.

The spelling of 1289461420 in words is "one billion, two hundred eighty-nine million, four hundred sixty-one thousand, four hundred twenty".