3129385 has 24 divisors (see below), whose sum is σ = 4469256. Its totient is φ = 2096640.

The previous prime is 3129383. The next prime is 3129391. The reversal of 3129385 is 5839213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 906304 + 2223081 = 952^2 + 1491^2 .

It is not a de Polignac number, because 3129385 - 2¹ = 3129383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12865 + ... + 13105.

It is an arithmetic number, because the mean of its divisors is an integer number (186219).

Almost surely, 2^3129385 is an apocalyptic number.

3129385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3129385 is a deficient number, since it is larger than the sum of its proper divisors (1339871).

3129385 is a wasteful number, since it uses less digits than its factorization.

3129385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 306 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 3129385 is about 1769.0067834805. The cubic root of 3129385 is about 146.2692379787.

The spelling of 3129385 in words is "three million, one hundred twenty-nine thousand, three hundred eighty-five".