209472942 has 24 divisors (see below), whose sum is σ = 487345896. Its totient is φ = 59849328.

The previous prime is 209472919. The next prime is 209472953. The reversal of 209472942 is 249274902.

It is a self number, because there is not a number n which added to its sum of digits gives 209472942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355953 + ... + 356540.

It is an arithmetic number, because the mean of its divisors is an integer number (20306079).

Almost surely, 2^209472942 is an apocalyptic number.

209472942 is an abundant number, since it is smaller than the sum of its proper divisors (277872954).

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

209472942 is a wasteful number, since it uses less digits than its factorization.

209472942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712512 (or 712505 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 209472942 is about 14473.1800928476. The cubic root of 209472942 is about 593.8945101699.

The spelling of 209472942 in words is "two hundred nine million, four hundred seventy-two thousand, nine hundred forty-two".