209103640 has 16 divisors (see below), whose sum is σ = 470483280. Its totient is φ = 83641440.

The previous prime is 209103589. The next prime is 209103679. The reversal of 209103640 is 46301902.

209103640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×209103640² = 87448664522499200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2613756 + ... + 2613835.

It is an arithmetic number, because the mean of its divisors is an integer number (29405205).

Almost surely, 2^209103640 is an apocalyptic number.

209103640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209103640 is an abundant number, since it is smaller than the sum of its proper divisors (261379640).

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

209103640 is a wasteful number, since it uses less digits than its factorization.

209103640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227602 (or 5227598 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 209103640 is about 14460.4163148922. The cubic root of 209103640 is about 593.5452917204.

The spelling of 209103640 in words is "two hundred nine million, one hundred three thousand, six hundred forty".