209748916 has 12 divisors (see below), whose sum is σ = 395296132. Its totient is φ = 96807168.

The previous prime is 209748887. The next prime is 209748919. The reversal of 209748916 is 619847902.

It can be written as a sum of positive squares in 2 ways, for example, as 64064016 + 145684900 = 8004^2 + 12070^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209748919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2016765 + ... + 2016868.

Almost surely, 2^209748916 is an apocalyptic number.

209748916 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

209748916 is a deficient number, since it is larger than the sum of its proper divisors (185547216).

209748916 is a wasteful number, since it uses less digits than its factorization.

209748916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033650 (or 4033648 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 209748916 is about 14482.7109340758. The cubic root of 209748916 is about 594.1552081502.

It can be divided in two parts, 20974 and 8916, that added together give a triangular number (29890 = T₂₄₄).

The spelling of 209748916 in words is "two hundred nine million, seven hundred forty-eight thousand, nine hundred sixteen".