1209909652 has 96 divisors (see below), whose sum is σ = 2634508800. Its totient is φ = 474439680.

The previous prime is 1209909629. The next prime is 1209909653. The reversal of 1209909652 is 2569099021.

It is a happy number.

It is a super-2 number, since 2×1209909652² = 2927762732005522208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1209909599 and 1209909608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209909653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5020252 + ... + 5020492.

It is an arithmetic number, because the mean of its divisors is an integer number (27442800).

Almost surely, 2^1209909652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209909652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317254400).

1209909652 is an abundant number, since it is smaller than the sum of its proper divisors (1424599148).

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

1209909652 is a wasteful number, since it uses less digits than its factorization.

1209909652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 1209909652 is about 34783.7555764181. The cubic root of 1209909652 is about 1065.5757140594.

The spelling of 1209909652 in words is "one billion, two hundred nine million, nine hundred nine thousand, six hundred fifty-two".