39394381 has 8 divisors (see below), whose sum is σ = 43571864. Its totient is φ = 35380800.

The previous prime is 39394379. The next prime is 39394427. The reversal of 39394381 is 18349393.

It can be written as a sum of positive squares in 4 ways, for example, as 17388900 + 22005481 = 4170^2 + 4691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39394381 - 2¹ = 39394379 is a prime.

It is a super-2 number, since 2×39394381² = 3103834508746322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39394351) 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, 40470 + ... + 41431.

It is an arithmetic number, because the mean of its divisors is an integer number (5446483).

Almost surely, 2^39394381 is an apocalyptic number.

It is an amenable number.

39394381 is a deficient number, since it is larger than the sum of its proper divisors (4177483).

39394381 is a wasteful number, since it uses less digits than its factorization.

39394381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81951.

The product of its digits is 69984, while the sum is 40.

The square root of 39394381 is about 6276.4943240634. The cubic root of 39394381 is about 340.2604146777.

The spelling of 39394381 in words is "thirty-nine million, three hundred ninety-four thousand, three hundred eighty-one".