209125940 has 24 divisors (see below), whose sum is σ = 442079232. Its totient is φ = 83095200.

The previous prime is 209125937. The next prime is 209125949. The reversal of 209125940 is 49521902.

It is a junction number, because it is equal to n+sod(n) for n = 209125897 and 209125906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209125949) 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, 31604 + ... + 37643.

It is an arithmetic number, because the mean of its divisors is an integer number (18419968).

Almost surely, 2^209125940 is an apocalyptic number.

209125940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209125940 is an abundant number, since it is smaller than the sum of its proper divisors (232953292).

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

209125940 is a wasteful number, since it uses less digits than its factorization.

209125940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69407 (or 69405 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 209125940 is about 14461.1873648051. The cubic root of 209125940 is about 593.5663906509.

The spelling of 209125940 in words is "two hundred nine million, one hundred twenty-five thousand, nine hundred forty".