209990534 has 16 divisors (see below), whose sum is σ = 339455760. Its totient is φ = 96850080.

The previous prime is 209990531. The next prime is 209990549. The reversal of 209990534 is 435099902.

It is a junction number, because it is equal to n+sod(n) for n = 209990491 and 209990500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209990531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64424 + ... + 67604.

It is an arithmetic number, because the mean of its divisors is an integer number (21215985).

Almost surely, 2^209990534 is an apocalyptic number.

209990534 is a deficient number, since it is larger than the sum of its proper divisors (129465226).

209990534 is a wasteful number, since it uses less digits than its factorization.

209990534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5735.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 209990534 is about 14491.0501344796. The cubic root of 209990534 is about 594.3832641635.

The spelling of 209990534 in words is "two hundred nine million, nine hundred ninety thousand, five hundred thirty-four".