420641402 has 4 divisors (see below), whose sum is σ = 630962106. Its totient is φ = 210320700.

The previous prime is 420641341. The next prime is 420641447. The reversal of 420641402 is 204146024.

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., 418570681 + 2070721 = 20459^2 + 1439^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105160349 + ... + 105160352.

Almost surely, 2^420641402 is an apocalyptic number.

420641402 is a deficient number, since it is larger than the sum of its proper divisors (210320704).

420641402 is a wasteful number, since it uses less digits than its factorization.

420641402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210320703.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 420641402 is about 20509.5441685085. The cubic root of 420641402 is about 749.2682652809.

Adding to 420641402 its reverse (204146024), we get a palindrome (624787426).

The spelling of 420641402 in words is "four hundred twenty million, six hundred forty-one thousand, four hundred two".