209536142 has 16 divisors (see below), whose sum is σ = 331128960. Its totient is φ = 99169272.

The previous prime is 209536139. The next prime is 209536181. The reversal of 209536142 is 241635902.

It is a happy number.

209536142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 209536099 and 209536108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82463 + ... + 84965.

It is an arithmetic number, because the mean of its divisors is an integer number (20695560).

Almost surely, 2^209536142 is an apocalyptic number.

209536142 is a deficient number, since it is larger than the sum of its proper divisors (121592818).

209536142 is a wasteful number, since it uses less digits than its factorization.

209536142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 209536142 is about 14475.3632769613. The cubic root of 209536142 is about 593.9542320581.

The spelling of 209536142 in words is "two hundred nine million, five hundred thirty-six thousand, one hundred forty-two".