209512942 has 32 divisors (see below), whose sum is σ = 336061440. Its totient is φ = 97796160.

The previous prime is 209512939. The next prime is 209512951. The reversal of 209512942 is 249215902.

It is a junction number, because it is equal to n+sod(n) for n = 209512898 and 209512907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236833 + ... + 237715.

It is an arithmetic number, because the mean of its divisors is an integer number (10501920).

Almost surely, 2^209512942 is an apocalyptic number.

209512942 is a deficient number, since it is larger than the sum of its proper divisors (126548498).

209512942 is a wasteful number, since it uses less digits than its factorization.

209512942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 209512942 is about 14474.5618931973. The cubic root of 209512942 is about 593.9323102285.

Adding to 209512942 its product of nonzero digits (12960), we get a palindrome (209525902).

The spelling of 209512942 in words is "two hundred nine million, five hundred twelve thousand, nine hundred forty-two".