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987946889 = 1439686551
BaseRepresentation
bin111010111000101…
…101111110001001
32112211222220100112
4322320231332021
54010403300024
6242011044105
733324260426
oct7270557611
92484886315
10987946889
11467741136
12236a40635
131298a9c77
14952d0d4d
155bb0000e
hex3ae2df89

987946889 has 4 divisors (see below), whose sum is σ = 988634880. Its totient is φ = 987258900.

The previous prime is 987946877. The next prime is 987946913. The reversal of 987946889 is 988649789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988649789 = 6714755967.

It is a cyclic number.

It is not a de Polignac number, because 987946889 - 28 = 987946633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987946829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341837 + ... + 344714.

It is an arithmetic number, because the mean of its divisors is an integer number (247158720).

Almost surely, 2987946889 is an apocalyptic number.

It is an amenable number.

987946889 is a deficient number, since it is larger than the sum of its proper divisors (687991).

987946889 is a wasteful number, since it uses less digits than its factorization.

987946889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687990.

The product of its digits is 62705664, while the sum is 68.

The square root of 987946889 is about 31431.6224366481. The cubic root of 987946889 is about 995.9660454251.

The spelling of 987946889 in words is "nine hundred eighty-seven million, nine hundred forty-six thousand, eight hundred eighty-nine".

Divisors: 1 1439 686551 987946889