209977047 has 48 divisors (see below), whose sum is σ = 373351680. Its totient is φ = 110981376.

The previous prime is 209977003. The next prime is 209977057. The reversal of 209977047 is 740779902.

It is a happy number.

It is not a de Polignac number, because 209977047 - 2⁶ = 209976983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209976993 and 209977011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209977057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61528 + ... + 64850.

It is an arithmetic number, because the mean of its divisors is an integer number (7778160).

Almost surely, 2^209977047 is an apocalyptic number.

209977047 is a deficient number, since it is larger than the sum of its proper divisors (163374633).

209977047 is a wasteful number, since it uses less digits than its factorization.

209977047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412 (or 3409 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 209977047 is about 14490.5847708089. The cubic root of 209977047 is about 594.3705387983.

The spelling of 209977047 in words is "two hundred nine million, nine hundred seventy-seven thousand, forty-seven".