209749941 has 12 divisors (see below), whose sum is σ = 303282720. Its totient is φ = 139689960.

The previous prime is 209749931. The next prime is 209749957. The reversal of 209749941 is 149947902.

It is a happy number.

It is not a de Polignac number, because 209749941 - 2⁵ = 209749909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209749931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2265 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (25273560).

Almost surely, 2^209749941 is an apocalyptic number.

It is an amenable number.

209749941 is a deficient number, since it is larger than the sum of its proper divisors (93532779).

209749941 is a wasteful number, since it uses less digits than its factorization.

209749941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23896 (or 23893 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 209749941 is about 14482.7463210539. The cubic root of 209749941 is about 594.1561759869.

The spelling of 209749941 in words is "two hundred nine million, seven hundred forty-nine thousand, nine hundred forty-one".