1240788280 has 16 divisors (see below), whose sum is σ = 2791773720. Its totient is φ = 496315296.

The previous prime is 1240788271. The next prime is 1240788347. The reversal of 1240788280 is 828870421.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 31019707 = 1240788280 / (1 + 2 + 4 + 0 + 7 + 8 + 8 + 2 + 8 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15509814 + ... + 15509893.

Almost surely, 2^1240788280 is an apocalyptic number.

1240788280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240788280 is an abundant number, since it is smaller than the sum of its proper divisors (1550985440).

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

1240788280 is a wasteful number, since it uses less digits than its factorization.

1240788280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31019718 (or 31019714 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 1240788280 is about 35224.8247689041. The cubic root of 1240788280 is about 1074.5646782560.

The spelling of 1240788280 in words is "one billion, two hundred forty million, seven hundred eighty-eight thousand, two hundred eighty".