209722439652 has 24 divisors (see below), whose sum is σ = 533838937632. Its totient is φ = 63552254400.

The previous prime is 209722439651. The next prime is 209722439653. The reversal of 209722439652 is 256934227902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (209722439651) and next prime (209722439653).

It is a super-2 number, since 2×209722439652² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209722439595 and 209722439604.

It is not an unprimeable number, because it can be changed into a prime (209722439651) 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, 794403049 + ... + 794403312.

It is an arithmetic number, because the mean of its divisors is an integer number (22243289068).

Almost surely, 2^209722439652 is an apocalyptic number.

209722439652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209722439652 is an abundant number, since it is smaller than the sum of its proper divisors (324116497980).

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

209722439652 is a wasteful number, since it uses less digits than its factorization.

209722439652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588806379 (or 1588806377 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 51.

The spelling of 209722439652 in words is "two hundred nine billion, seven hundred twenty-two million, four hundred thirty-nine thousand, six hundred fifty-two".