1000157988 has 12 divisors (see below), whose sum is σ = 2333702000. Its totient is φ = 333385992.

The previous prime is 1000157909. The next prime is 1000157993. The reversal of 1000157988 is 8897510001.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41673238 + ... + 41673261.

Almost surely, 2^1000157988 is an apocalyptic number.

It is an amenable number.

1000157988 is an abundant number, since it is smaller than the sum of its proper divisors (1333544012).

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

1000157988 is a wasteful number, since it uses less digits than its factorization.

1000157988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83346506 (or 83346504 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 1000157988 is about 31625.2745126426. The cubic root of 1000157988 is about 1000.0526598936.

Adding to 1000157988 its reverse (8897510001), we get a palindrome (9897667989).

The spelling of 1000157988 in words is "one billion, one hundred fifty-seven thousand, nine hundred eighty-eight".