209348990 has 16 divisors (see below), whose sum is σ = 393212448. Its totient is φ = 80098656.

The previous prime is 209348987. The next prime is 209349001. The reversal of 209348990 is 99843902.

It is a super-2 number, since 2×209348990² = 87653999228040200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454877 + ... + 455336.

It is an arithmetic number, because the mean of its divisors is an integer number (24575778).

Almost surely, 2^209348990 is an apocalyptic number.

209348990 is a deficient number, since it is larger than the sum of its proper divisors (183863458).

209348990 is a wasteful number, since it uses less digits than its factorization.

209348990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910243.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 209348990 is about 14468.8973318633. The cubic root of 209348990 is about 593.7773447794. Note that the first 3 decimals are identical.

The spelling of 209348990 in words is "two hundred nine million, three hundred forty-eight thousand, nine hundred ninety".