81846437 has 4 divisors (see below), whose sum is σ = 81872736. Its totient is φ = 81820140.

The previous prime is 81846421. The next prime is 81846451. The reversal of 81846437 is 73464818.

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.

It is a cyclic number.

It is not a de Polignac number, because 81846437 - 2⁴ = 81846421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81846394 and 81846403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81846407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7739 + ... + 14952.

It is an arithmetic number, because the mean of its divisors is an integer number (20468184).

Almost surely, 2^81846437 is an apocalyptic number.

It is an amenable number.

81846437 is a deficient number, since it is larger than the sum of its proper divisors (26299).

81846437 is a wasteful number, since it uses less digits than its factorization.

81846437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26298.

The product of its digits is 129024, while the sum is 41.

The square root of 81846437 is about 9046.9020664535. The cubic root of 81846437 is about 434.1767792651.

The spelling of 81846437 in words is "eighty-one million, eight hundred forty-six thousand, four hundred thirty-seven".