202540402 has 4 divisors (see below), whose sum is σ = 303810606. Its totient is φ = 101270200.

The previous prime is 202540381. The next prime is 202540423. The reversal of 202540402 is 204045202.

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

It is an interprime number because it is at equal distance from previous prime (202540381) and next prime (202540423).

It can be written as a sum of positive squares in only one way, i.e., 154778481 + 47761921 = 12441^2 + 6911^2 .

It is a super-2 number, since 2×202540402² = 82045228884643208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 202540402.

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, 50635099 + ... + 50635102.

Almost surely, 2^202540402 is an apocalyptic number.

202540402 is a deficient number, since it is larger than the sum of its proper divisors (101270204).

202540402 is a wasteful number, since it uses less digits than its factorization.

202540402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101270203.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 202540402 is about 14231.6689815355. The cubic root of 202540402 is about 587.2691975246.

Adding to 202540402 its reverse (204045202), we get a palindrome (406585604).

The spelling of 202540402 in words is "two hundred two million, five hundred forty thousand, four hundred two".