209273340 has 48 divisors (see below), whose sum is σ = 591671808. Its totient is φ = 55262784.

The previous prime is 209273333. The next prime is 209273347. The reversal of 209273340 is 43372902.

It is an interprime number because it is at equal distance from previous prime (209273333) and next prime (209273347).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 209273298 and 209273307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209273347) 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, 10752 + ... + 23111.

It is an arithmetic number, because the mean of its divisors is an integer number (12326496).

Almost surely, 2^209273340 is an apocalyptic number.

209273340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209273340 is an abundant number, since it is smaller than the sum of its proper divisors (382398468).

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

209273340 is a wasteful number, since it uses less digits than its factorization.

209273340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33978 (or 33976 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 209273340 is about 14466.2828674128. The cubic root of 209273340 is about 593.7058140341.

The spelling of 209273340 in words is "two hundred nine million, two hundred seventy-three thousand, three hundred forty".