425519640 has 384 divisors, whose sum is σ = 1761177600. Its totient is φ = 86676480.

The previous prime is 425519629. The next prime is 425519641. The reversal of 425519640 is 46915524.

425519640 is a `hidden beast` number, since 4 + 2 + 5 + 5 + 1 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 425519595 and 425519604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425519641) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1015351 + ... + 1015769.

It is an arithmetic number, because the mean of its divisors is an integer number (4586400).

Almost surely, 2^425519640 is an apocalyptic number.

425519640 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 425519640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880588800).

425519640 is an abundant number, since it is smaller than the sum of its proper divisors (1335657960).

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

425519640 is a wasteful number, since it uses less digits than its factorization.

425519640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 425519640 is about 20628.1273992575. The cubic root of 425519640 is about 752.1535967756.

The spelling of 425519640 in words is "four hundred twenty-five million, five hundred nineteen thousand, six hundred forty".