420090000 has 400 divisors, whose sum is σ = 1580494080. Its totient is φ = 95040000.

The previous prime is 420089993. The next prime is 420090023. The reversal of 420090000 is 90024.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6269967 + ... + 6270033.

Almost surely, 2^420090000 is an apocalyptic number.

420090000 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 420090000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790247040).

420090000 is an abundant number, since it is smaller than the sum of its proper divisors (1160404080).

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

420090000 is a wasteful number, since it uses less digits than its factorization.

420090000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 420090000 is about 20496.0971894651. The cubic root of 420090000 is about 748.9407268471.

The spelling of 420090000 in words is "four hundred twenty million, ninety thousand".