1228981040 has 80 divisors (see below), whose sum is σ = 3270647808. Its totient is φ = 420711168.

The previous prime is 1228981037. The next prime is 1228981049. The reversal of 1228981040 is 401898221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1228981049) 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, 482009 + ... + 484551.

Almost surely, 2^1228981040 is an apocalyptic number.

1228981040 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 1228981040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635323904).

1228981040 is an abundant number, since it is smaller than the sum of its proper divisors (2041666768).

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

1228981040 is a wasteful number, since it uses less digits than its factorization.

1228981040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 3420 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1228981040 is about 35056.8258688661. The cubic root of 1228981040 is about 1071.1453191722.

The spelling of 1228981040 in words is "one billion, two hundred twenty-eight million, nine hundred eighty-one thousand, forty".