39145825 has 6 divisors (see below), whose sum is σ = 48540854. Its totient is φ = 31316640.

The previous prime is 39145823. The next prime is 39145837. The reversal of 39145825 is 52854193.

It can be written as a sum of positive squares in 3 ways, for example, as 1347921 + 37797904 = 1161^2 + 6148^2 .

It is not a de Polignac number, because 39145825 - 2¹ = 39145823 is a prime.

It is a super-2 number, since 2×39145825² = 3064791229861250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39145823) 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, 782892 + ... + 782941.

Almost surely, 2^39145825 is an apocalyptic number.

It is an amenable number.

39145825 is a deficient number, since it is larger than the sum of its proper divisors (9395029).

39145825 is a wasteful number, since it uses less digits than its factorization.

39145825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565843 (or 1565838 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 39145825 is about 6256.6624489419. The cubic root of 39145825 is about 339.5432881714.

The spelling of 39145825 in words is "thirty-nine million, one hundred forty-five thousand, eight hundred twenty-five".