209474394 has 16 divisors (see below), whose sum is σ = 427863168. Its totient is φ = 68339072.

The previous prime is 209474393. The next prime is 209474399. The reversal of 209474394 is 493474902.

It is not an unprimeable number, because it can be changed into a prime (209474393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371127 + ... + 371690.

It is an arithmetic number, because the mean of its divisors is an integer number (26741448).

Almost surely, 2^209474394 is an apocalyptic number.

209474394 is an abundant number, since it is smaller than the sum of its proper divisors (218388774).

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

209474394 is a wasteful number, since it uses less digits than its factorization.

209474394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742869.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 209474394 is about 14473.2302545078. The cubic root of 209474394 is about 593.8958823962.

The spelling of 209474394 in words is "two hundred nine million, four hundred seventy-four thousand, three hundred ninety-four".