39881245 has 4 divisors (see below), whose sum is σ = 47857500. Its totient is φ = 31904992.

The previous prime is 39881243. The next prime is 39881249. The reversal of 39881245 is 54218893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54218893 = 29 ⋅1869617.

It can be written as a sum of positive squares in 2 ways, for example, as 5938969 + 33942276 = 2437^2 + 5826^2 .

It is a cyclic number.

It is not a de Polignac number, because 39881245 - 2¹ = 39881243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39881198 and 39881207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39881243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3988120 + ... + 3988129.

It is an arithmetic number, because the mean of its divisors is an integer number (11964375).

Almost surely, 2^39881245 is an apocalyptic number.

It is an amenable number.

39881245 is a deficient number, since it is larger than the sum of its proper divisors (7976255).

39881245 is an equidigital number, since it uses as much as digits as its factorization.

39881245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7976254.

The product of its digits is 69120, while the sum is 40.

The square root of 39881245 is about 6315.1599346335. The cubic root of 39881245 is about 341.6564068570.

The spelling of 39881245 in words is "thirty-nine million, eight hundred eighty-one thousand, two hundred forty-five".