425421990 has 256 divisors, whose sum is σ = 1373552640. Its totient is φ = 91653120.

The previous prime is 425421977. The next prime is 425422069. The reversal of 425421990 is 99124524.

425421990 is a `hidden beast` number, since 425 + 42 + 199 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3105202 + ... + 3105338.

It is an arithmetic number, because the mean of its divisors is an integer number (5365440).

Almost surely, 2^425421990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 425421990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686776320).

425421990 is an abundant number, since it is smaller than the sum of its proper divisors (948130650).

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

425421990 is a wasteful number, since it uses less digits than its factorization.

425421990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 425421990 is about 20625.7603496211. The cubic root of 425421990 is about 752.0960566051.

It can be divided in two parts, 4254 and 21990, that added together give a square (26244 = 162²).

The spelling of 425421990 in words is "four hundred twenty-five million, four hundred twenty-one thousand, nine hundred ninety".