39912225 has 12 divisors (see below), whose sum is σ = 65988336. Its totient is φ = 21286480.

The previous prime is 39912211. The next prime is 39912227. The reversal of 39912225 is 52221993.

It is not a de Polignac number, because 39912225 - 2⁶ = 39912161 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (39912227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266007 + ... + 266156.

It is an arithmetic number, because the mean of its divisors is an integer number (5499028).

Almost surely, 2^39912225 is an apocalyptic number.

It is an amenable number.

39912225 is a deficient number, since it is larger than the sum of its proper divisors (26076111).

39912225 is a wasteful number, since it uses less digits than its factorization.

39912225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532176 (or 532171 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 39912225 is about 6317.6122862993. The cubic root of 39912225 is about 341.7448509026.

It can be divided in two parts, 3991 and 2225, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 39912225 in words is "thirty-nine million, nine hundred twelve thousand, two hundred twenty-five".