78186141 has 20 divisors (see below), whose sum is σ = 127415904. Its totient is φ = 47385000.

The previous prime is 78186133. The next prime is 78186149. The reversal of 78186141 is 14168187.

It is an interprime number because it is at equal distance from previous prime (78186133) and next prime (78186149).

It is not a de Polignac number, because 78186141 - 2³ = 78186133 is a prime.

It is a super-2 number, since 2×78186141² = 12226145288943762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78186096 and 78186105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78186149) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42985 + ... + 44766.

Almost surely, 2^78186141 is an apocalyptic number.

It is an amenable number.

78186141 is a deficient number, since it is larger than the sum of its proper divisors (49229763).

78186141 is a wasteful number, since it uses less digits than its factorization.

78186141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87774 (or 87765 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 78186141 is about 8842.2927456627. The cubic root of 78186141 is about 427.6054772052.

The spelling of 78186141 in words is "seventy-eight million, one hundred eighty-six thousand, one hundred forty-one".