209406082 has 4 divisors (see below), whose sum is σ = 314109126. Its totient is φ = 104703040.

The previous prime is 209406061. The next prime is 209406139. The reversal of 209406082 is 280604902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 189860841 + 19545241 = 13779^2 + 4421^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52351519 + ... + 52351522.

Almost surely, 2^209406082 is an apocalyptic number.

209406082 is a deficient number, since it is larger than the sum of its proper divisors (104703044).

209406082 is a wasteful number, since it uses less digits than its factorization.

209406082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104703043.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 209406082 is about 14470.8701189666. The cubic root of 209406082 is about 593.8313166264.

The spelling of 209406082 in words is "two hundred nine million, four hundred six thousand, eighty-two".