420370638 has 8 divisors (see below), whose sum is σ = 840741288. Its totient is φ = 140123544.

The previous prime is 420370637. The next prime is 420370651. The reversal of 420370638 is 836073024.

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

420370638 is an admirable number.

It is a super-2 number, since 2×420370638² = 353422946585054088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420370599 and 420370608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420370637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35030881 + ... + 35030892.

It is an arithmetic number, because the mean of its divisors is an integer number (105092661).

Almost surely, 2^420370638 is an apocalyptic number.

420370638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420370638 is a wasteful number, since it uses less digits than its factorization.

420370638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70061778.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 420370638 is about 20502.9421791118. The cubic root of 420370638 is about 749.1074644840.

The spelling of 420370638 in words is "four hundred twenty million, three hundred seventy thousand, six hundred thirty-eight".