209452980 has 48 divisors (see below), whose sum is σ = 639785664. Its totient is φ = 50776320.

The previous prime is 209452963. The next prime is 209452981. The reversal of 209452980 is 89254902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209452981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158017 + ... + 159336.

It is an arithmetic number, because the mean of its divisors is an integer number (13328868).

Almost surely, 2^209452980 is an apocalyptic number.

209452980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209452980 is an abundant number, since it is smaller than the sum of its proper divisors (430332684).

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

209452980 is a wasteful number, since it uses less digits than its factorization.

209452980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317376 (or 317374 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 209452980 is about 14472.4904560342. The cubic root of 209452980 is about 593.8756442506.

The spelling of 209452980 in words is "two hundred nine million, four hundred fifty-two thousand, nine hundred eighty".