209390434 has 16 divisors (see below), whose sum is σ = 345108960. Its totient is φ = 94491360.

The previous prime is 209390383. The next prime is 209390449. The reversal of 209390434 is 434093902.

209390434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 209390434.

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, 31179 + ... + 37294.

It is an arithmetic number, because the mean of its divisors is an integer number (21569310).

Almost surely, 2^209390434 is an apocalyptic number.

209390434 is a deficient number, since it is larger than the sum of its proper divisors (135718526).

209390434 is a wasteful number, since it uses less digits than its factorization.

209390434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68625.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 209390434 is about 14470.3294364710. The cubic root of 209390434 is about 593.8165247862.

The spelling of 209390434 in words is "two hundred nine million, three hundred ninety thousand, four hundred thirty-four".