81374 has 16 divisors (see below), whose sum is σ = 133920. Its totient is φ = 36960.

The previous prime is 81373. The next prime is 81401. The reversal of 81374 is 47318.

81374 = 2² + 3² + ... + 62².

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a plaindrome in base 9 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81371) 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, 1304 + ... + 1364.

It is an arithmetic number, because the mean of its divisors is an integer number (8370).

2⁸¹³⁷⁴ is an apocalyptic number.

81374 is a deficient number, since it is larger than the sum of its proper divisors (52546).

81374 is a wasteful number, since it uses less digits than its factorization.

81374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115.

The product of its digits is 672, while the sum is 23.

The square root of 81374 is about 285.2612837383. The cubic root of 81374 is about 43.3339776367. Note that the first 3 decimals are identical.

The spelling of 81374 in words is "eighty-one thousand, three hundred seventy-four".