1025887642 has 8 divisors (see below), whose sum is σ = 1657203156. Its totient is φ = 473486592.

The previous prime is 1025887631. The next prime is 1025887651. The reversal of 1025887642 is 2467885201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 974750841 + 51136801 = 31221^2 + 7151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19728583 + ... + 19728634.

Almost surely, 2^1025887642 is an apocalyptic number.

1025887642 is a deficient number, since it is larger than the sum of its proper divisors (631315514).

1025887642 is a wasteful number, since it uses less digits than its factorization.

1025887642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39457232.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 1025887642 is about 32029.4808262638. The cubic root of 1025887642 is about 1008.5558034605. Note that the first 3 decimals are identical.

The spelling of 1025887642 in words is "one billion, twenty-five million, eight hundred eighty-seven thousand, six hundred forty-two".