1238215840 has 24 divisors (see below), whose sum is σ = 2925285300. Its totient is φ = 495286272.

The previous prime is 1238215817. The next prime is 1238215861. The reversal of 1238215840 is 485128321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1179785104 + 58430736 = 34348^2 + 7644^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1238215796 and 1238215805.

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, 3869265 + ... + 3869584.

Almost surely, 2^1238215840 is an apocalyptic number.

1238215840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1238215840 is an abundant number, since it is smaller than the sum of its proper divisors (1687069460).

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

1238215840 is an equidigital number, since it uses as much as digits as its factorization.

1238215840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7738864 (or 7738856 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 1238215840 is about 35188.2912344433. The cubic root of 1238215840 is about 1073.8215577414.

The spelling of 1238215840 in words is "one billion, two hundred thirty-eight million, two hundred fifteen thousand, eight hundred forty".