987138956 has 6 divisors (see below), whose sum is σ = 1727493180. Its totient is φ = 493569476.

The previous prime is 987138937. The next prime is 987139037. The reversal of 987138956 is 659831789.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123392366 + ... + 123392373.

It is an arithmetic number, because the mean of its divisors is an integer number (287915530).

Almost surely, 2^987138956 is an apocalyptic number.

It is an amenable number.

987138956 is a deficient number, since it is larger than the sum of its proper divisors (740354224).

987138956 is a wasteful number, since it uses less digits than its factorization.

987138956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246784743 (or 246784741 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 56.

The square root of 987138956 is about 31418.7675760842. The cubic root of 987138956 is about 995.6944743872.

The spelling of 987138956 in words is "nine hundred eighty-seven million, one hundred thirty-eight thousand, nine hundred fifty-six".