220400402 has 4 divisors (see below), whose sum is σ = 330600606. Its totient is φ = 110200200.

The previous prime is 220400371. The next prime is 220400417. The reversal of 220400402 is 204004022.

It is a happy number.

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., 184172041 + 36228361 = 13571^2 + 6019^2 .

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, 55100099 + ... + 55100102.

Almost surely, 2^220400402 is an apocalyptic number.

220400402 is a deficient number, since it is larger than the sum of its proper divisors (110200204).

220400402 is a wasteful number, since it uses less digits than its factorization.

220400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110200203.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 220400402 is about 14845.8883870249. Note that the first 3 decimals coincide. The cubic root of 220400402 is about 604.0470867345.

Adding to 220400402 its reverse (204004022), we get a palindrome (424404424).

It can be divided in two parts, 2 and 20400402, that multiplied together give a palindrome (40800804).

The spelling of 220400402 in words is "two hundred twenty million, four hundred thousand, four hundred two".