420579638 has 4 divisors (see below), whose sum is σ = 630869460. Its totient is φ = 210289818.

The previous prime is 420579637. The next prime is 420579673. The reversal of 420579638 is 836975024.

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

It is a super-2 number, since 2×420579638² = 353774463800422088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420579631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105144908 + ... + 105144911.

It is an arithmetic number, because the mean of its divisors is an integer number (157717365).

Almost surely, 2^420579638 is an apocalyptic number.

420579638 is a deficient number, since it is larger than the sum of its proper divisors (210289822).

420579638 is a wasteful number, since it uses less digits than its factorization.

420579638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210289821.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 420579638 is about 20508.0383752323. The cubic root of 420579638 is about 749.2315910732.

The spelling of 420579638 in words is "four hundred twenty million, five hundred seventy-nine thousand, six hundred thirty-eight".