1288421376 has 120 divisors (see below), whose sum is σ = 3749593344. Its totient is φ = 390266880.

The previous prime is 1288421371. The next prime is 1288421401. The reversal of 1288421376 is 6731248821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288421371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539481 + ... + 541863.

Almost surely, 2^1288421376 is an apocalyptic number.

1288421376 is a gapful number since it is divisible by the number (16) 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 1288421376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874796672).

1288421376 is an abundant number, since it is smaller than the sum of its proper divisors (2461171968).

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

1288421376 is an equidigital number, since it uses as much as digits as its factorization.

1288421376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2399 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 1288421376 is about 35894.5870013850. The cubic root of 1288421376 is about 1088.1430031180.

The spelling of 1288421376 in words is "one billion, two hundred eighty-eight million, four hundred twenty-one thousand, three hundred seventy-six".