1277940480 has 144 divisors (see below), whose sum is σ = 4181484384. Its totient is φ = 332431360.

The previous prime is 1277940463. The next prime is 1277940487. The reversal of 1277940480 is 840497721.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1277940487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153382 + ... + 161498.

It is an arithmetic number, because the mean of its divisors is an integer number (29038086).

Almost surely, 2^1277940480 is an apocalyptic number.

1277940480 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 1277940480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2090742192).

1277940480 is an abundant number, since it is smaller than the sum of its proper divisors (2903543904).

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

1277940480 is an equidigital number, since it uses as much as digits as its factorization.

1277940480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182 (or 8168 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 1277940480 is about 35748.2933858387. The cubic root of 1277940480 is about 1085.1844009745.

The spelling of 1277940480 in words is "one billion, two hundred seventy-seven million, nine hundred forty thousand, four hundred eighty".