1229987840 has 56 divisors (see below), whose sum is σ = 2951888940. Its totient is φ = 491978752.

The previous prime is 1229987827. The next prime is 1229987879. The reversal of 1229987840 is 487899221.

It can be written as a sum of positive squares in 2 ways, for example, as 1146228736 + 83759104 = 33856^2 + 9152^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25946 + ... + 55974.

Almost surely, 2^1229987840 is an apocalyptic number.

1229987840 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 1229987840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475944470).

1229987840 is an abundant number, since it is smaller than the sum of its proper divisors (1721901100).

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

1229987840 is an frugal number, since it uses more digits than its factorization.

1229987840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30060 (or 30036 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1229987840 is about 35071.1824722235. The cubic root of 1229987840 is about 1071.4377388591.

The spelling of 1229987840 in words is "one billion, two hundred twenty-nine million, nine hundred eighty-seven thousand, eight hundred forty".