202009642 has 4 divisors (see below), whose sum is σ = 303014466. Its totient is φ = 101004820.

The previous prime is 202009637. The next prime is 202009663. The reversal of 202009642 is 246900202.

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., 201952521 + 57121 = 14211^2 + 239^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 50502409 + ... + 50502412.

Almost surely, 2^202009642 is an apocalyptic number.

202009642 is a deficient number, since it is larger than the sum of its proper divisors (101004824).

202009642 is a wasteful number, since it uses less digits than its factorization.

202009642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101004823.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 202009642 is about 14213.0096038805. The cubic root of 202009642 is about 586.7557663543.

Adding to 202009642 its reverse (246900202), we get a palindrome (448909844).

The spelling of 202009642 in words is "two hundred two million, nine thousand, six hundred forty-two".