420492640 has 48 divisors (see below), whose sum is σ = 999425952. Its totient is φ = 167179264.

The previous prime is 420492623. The next prime is 420492641. The reversal of 420492640 is 46294024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420492641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18852 + ... + 34588.

It is an arithmetic number, because the mean of its divisors is an integer number (20821374).

Almost surely, 2^420492640 is an apocalyptic number.

420492640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420492640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499712976).

420492640 is an abundant number, since it is smaller than the sum of its proper divisors (578933312).

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

420492640 is a wasteful number, since it uses less digits than its factorization.

420492640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15919 (or 15911 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 420492640 is about 20505.9171948001. The cubic root of 420492640 is about 749.1799273383.

The spelling of 420492640 in words is "four hundred twenty million, four hundred ninety-two thousand, six hundred forty".