104991987 has 8 divisors (see below), whose sum is σ = 146075904. Its totient is φ = 66951368.

The previous prime is 104991973. The next prime is 104992007. The reversal of 104991987 is 789199401.

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 104991987 - 2¹² = 104987891 is a prime.

It is a super-2 number, since 2×104991987² = 22046634668416338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (104991907) 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, 760743 + ... + 760880.

It is an arithmetic number, because the mean of its divisors is an integer number (18259488).

Almost surely, 2^104991987 is an apocalyptic number.

104991987 is a deficient number, since it is larger than the sum of its proper divisors (41083917).

104991987 is a wasteful number, since it uses less digits than its factorization.

104991987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521649.

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 104991987 is about 10246.5597641355. The cubic root of 104991987 is about 471.7573968115.

The spelling of 104991987 in words is "one hundred four million, nine hundred ninety-one thousand, nine hundred eighty-seven".