209402992180 has 24 divisors (see below), whose sum is σ = 439844563872. Its totient is φ = 83742476832.

The previous prime is 209402992171. The next prime is 209402992187. The reversal of 209402992180 is 81299204902.

It is a super-2 number, since 2×209402992180² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209402992180.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209402992187) 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, 1078102 + ... + 1257421.

It is an arithmetic number, because the mean of its divisors is an integer number (18326856828).

Almost surely, 2^209402992180 is an apocalyptic number.

209402992180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209402992180 is an abundant number, since it is smaller than the sum of its proper divisors (230441571692).

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

209402992180 is a wasteful number, since it uses less digits than its factorization.

209402992180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340015 (or 2340013 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 209402992180 in words is "two hundred nine billion, four hundred two million, nine hundred ninety-two thousand, one hundred eighty".