39951649 has 6 divisors (see below), whose sum is σ = 42440294. Its totient is φ = 37601280.

The previous prime is 39951641. The next prime is 39951679. The reversal of 39951649 is 94615993.

It can be written as a sum of positive squares in 3 ways, for example, as 6969600 + 32982049 = 2640^2 + 5743^2 .

It is not a de Polignac number, because 39951649 - 2³ = 39951641 is a prime.

It is a super-2 number, since 2×39951649² = 3192268515638402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39951599 and 39951608.

It is not an unprimeable number, because it can be changed into a prime (39951641) 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, 68832 + ... + 69409.

Almost surely, 2^39951649 is an apocalyptic number.

It is an amenable number.

39951649 is a deficient number, since it is larger than the sum of its proper divisors (2488645).

39951649 is a wasteful number, since it uses less digits than its factorization.

39951649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138275 (or 138258 counting only the distinct ones).

The product of its digits is 262440, while the sum is 46.

The square root of 39951649 is about 6320.7316823292. The cubic root of 39951649 is about 341.8573353639.

The spelling of 39951649 in words is "thirty-nine million, nine hundred fifty-one thousand, six hundred forty-nine".