420400402 has 8 divisors (see below), whose sum is σ = 633113712. Its totient is φ = 209362500.

The previous prime is 420400397. The next prime is 420400427. The reversal of 420400402 is 204004024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418224 + ... + 419227.

It is an arithmetic number, because the mean of its divisors is an integer number (79139214).

Almost surely, 2^420400402 is an apocalyptic number.

420400402 is a deficient number, since it is larger than the sum of its proper divisors (212713310).

420400402 is a wasteful number, since it uses less digits than its factorization.

420400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837704.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 420400402 is about 20503.6680133092. The cubic root of 420400402 is about 749.1251440477.

Adding to 420400402 its reverse (204004024), we get a palindrome (624404426).

The spelling of 420400402 in words is "four hundred twenty million, four hundred thousand, four hundred two".