1238518980 has 144 divisors (see below), whose sum is σ = 3869362224. Its totient is φ = 320471040.

The previous prime is 1238518943. The next prime is 1238518997. The reversal of 1238518980 is 898158321.

It is a happy number.

1238518980 is a `hidden beast` number, since 12 + 38 + 518 + 98 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 32901696 + 1205617284 = 5736^2 + 34722^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1896334 + ... + 1896986.

It is an arithmetic number, because the mean of its divisors is an integer number (26870571).

Almost surely, 2^1238518980 is an apocalyptic number.

1238518980 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 1238518980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1934681112).

1238518980 is an abundant number, since it is smaller than the sum of its proper divisors (2630843244).

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

1238518980 is a wasteful number, since it uses less digits than its factorization.

1238518980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 1238518980 is about 35192.5983695436. The cubic root of 1238518980 is about 1073.9091815884.

The spelling of 1238518980 in words is "one billion, two hundred thirty-eight million, five hundred eighteen thousand, nine hundred eighty".