987185381 has 8 divisors (see below), whose sum is σ = 1214997504. Its totient is φ = 781069680.

The previous prime is 987185377. The next prime is 987185383. The reversal of 987185381 is 183581789.

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

It is a cyclic number.

It is not a de Polignac number, because 987185381 - 2² = 987185377 is a prime.

It is a super-2 number, since 2×987185381² = 1949069952920230322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987185383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5424005 + ... + 5424186.

It is an arithmetic number, because the mean of its divisors is an integer number (151874688).

Almost surely, 2^987185381 is an apocalyptic number.

987185381 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

987185381 is a deficient number, since it is larger than the sum of its proper divisors (227812123).

987185381 is a wasteful number, since it uses less digits than its factorization.

987185381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10848211.

The product of its digits is 483840, while the sum is 50.

The square root of 987185381 is about 31419.5063774083. The cubic root of 987185381 is about 995.7100832641.

The spelling of 987185381 in words is "nine hundred eighty-seven million, one hundred eighty-five thousand, three hundred eighty-one".