1425571638 has 16 divisors (see below), whose sum is σ = 2852843760. Its totient is φ = 474907136.

The previous prime is 1425571633. The next prime is 1425571657. The reversal of 1425571638 is 8361755241.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1425571638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1425571633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59823 + ... + 80186.

It is an arithmetic number, because the mean of its divisors is an integer number (178302735).

Almost surely, 2^1425571638 is an apocalyptic number.

1425571638 is an abundant number, since it is smaller than the sum of its proper divisors (1427272122).

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

1425571638 is a wasteful number, since it uses less digits than its factorization.

1425571638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141711.

The product of its digits is 201600, while the sum is 42.

The square root of 1425571638 is about 37756.7429474524. The cubic root of 1425571638 is about 1125.4590095343.

The spelling of 1425571638 in words is "one billion, four hundred twenty-five million, five hundred seventy-one thousand, six hundred thirty-eight".