1239828525 has 84 divisors (see below), whose sum is σ = 2482810708. Its totient is φ = 610260480.

The previous prime is 1239828521. The next prime is 1239828563. The reversal of 1239828525 is 5258289321.

1239828525 is a `hidden beast` number, since 12 + 3 + 98 + 28 + 525 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 2125764 + 1237702761 = 1458^2 + 35181^2 .

It is not a de Polignac number, because 1239828525 - 2² = 1239828521 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239828521) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 234309 + ... + 239541.

Almost surely, 2^1239828525 is an apocalyptic number.

1239828525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1239828525 is an abundant number, since it is smaller than the sum of its proper divisors (1242982183).

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

1239828525 is an equidigital number, since it uses as much as digits as its factorization.

1239828525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5274 (or 5254 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 1239828525 is about 35211.1988577498. The cubic root of 1239828525 is about 1074.2875466767.

The spelling of 1239828525 in words is "one billion, two hundred thirty-nine million, eight hundred twenty-eight thousand, five hundred twenty-five".