8181406 has 4 divisors (see below), whose sum is σ = 12272112. Its totient is φ = 4090702.

The previous prime is 8181389. The next prime is 8181421. The reversal of 8181406 is 6041818.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045350 + ... + 2045353.

It is an arithmetic number, because the mean of its divisors is an integer number (3068028).

Almost surely, 2^8181406 is an apocalyptic number.

8181406 is a deficient number, since it is larger than the sum of its proper divisors (4090706).

8181406 is a wasteful number, since it uses less digits than its factorization.

8181406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090705.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 8181406 is about 2860.3157168397. The cubic root of 8181406 is about 201.5004320359.

The spelling of 8181406 in words is "eight million, one hundred eighty-one thousand, four hundred six".