39129881 has 6 divisors (see below), whose sum is σ = 45518490. Its totient is φ = 33539856.

The previous prime is 39129863. The next prime is 39129887. The reversal of 39129881 is 18892193.

It can be written as a sum of positive squares in only one way, i.e., 31753225 + 7376656 = 5635^2 + 2716^2 .

It is not a de Polignac number, because 39129881 - 2⁶ = 39129817 is a prime.

It is a super-2 number, since 2×39129881² = 3062295174148322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39129887) 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 5 ways as a sum of consecutive naturals, for example, 399236 + ... + 399333.

It is an arithmetic number, because the mean of its divisors is an integer number (7586415).

Almost surely, 2^39129881 is an apocalyptic number.

It is an amenable number.

39129881 is a deficient number, since it is larger than the sum of its proper divisors (6388609).

39129881 is an equidigital number, since it uses as much as digits as its factorization.

39129881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798583 (or 798576 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 39129881 is about 6255.3881574208. The cubic root of 39129881 is about 339.4971835243.

The spelling of 39129881 in words is "thirty-nine million, one hundred twenty-nine thousand, eight hundred eighty-one".