1239509652 has 24 divisors (see below), whose sum is σ = 3017937216. Its totient is φ = 395205888.

The previous prime is 1239509647. The next prime is 1239509653. The reversal of 1239509652 is 2569059321.

It is a super-2 number, since 2×1239509652² = 3072768354802322208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239509653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2245213 + ... + 2245764.

It is an arithmetic number, because the mean of its divisors is an integer number (125747384).

Almost surely, 2^1239509652 is an apocalyptic number.

1239509652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1239509652 is an abundant number, since it is smaller than the sum of its proper divisors (1778427564).

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

1239509652 is a wasteful number, since it uses less digits than its factorization.

1239509652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491007 (or 4491005 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 1239509652 is about 35206.6705611309. The cubic root of 1239509652 is about 1074.1954396748.

The spelling of 1239509652 in words is "one billion, two hundred thirty-nine million, five hundred nine thousand, six hundred fifty-two".