81379342 has 32 divisors (see below), whose sum is σ = 138184704. Its totient is φ = 35620800.

The previous prime is 81379303. The next prime is 81379343. The reversal of 81379342 is 24397318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81379343) 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 15 ways as a sum of consecutive naturals, for example, 74323 + ... + 75409.

It is an arithmetic number, because the mean of its divisors is an integer number (4318272).

Almost surely, 2^81379342 is an apocalyptic number.

81379342 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81379342 is a deficient number, since it is larger than the sum of its proper divisors (56805362).

81379342 is a wasteful number, since it uses less digits than its factorization.

81379342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its digits is 36288, while the sum is 37.

The square root of 81379342 is about 9021.0499388929. The cubic root of 81379342 is about 433.3492587178.

The spelling of 81379342 in words is "eighty-one million, three hundred seventy-nine thousand, three hundred forty-two".