209492940 has 24 divisors (see below), whose sum is σ = 586580400. Its totient is φ = 55864768.

The previous prime is 209492939. The next prime is 209492963. The reversal of 209492940 is 49294902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1745715 + ... + 1745834.

It is an arithmetic number, because the mean of its divisors is an integer number (24440850).

Almost surely, 2^209492940 is an apocalyptic number.

209492940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209492940 is an abundant number, since it is smaller than the sum of its proper divisors (377087460).

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

209492940 is a wasteful number, since it uses less digits than its factorization.

209492940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491561 (or 3491559 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 209492940 is about 14473.8709404223. The cubic root of 209492940 is about 593.9134089106.

The spelling of 209492940 in words is "two hundred nine million, four hundred ninety-two thousand, nine hundred forty".