39671440 has 20 divisors (see below), whose sum is σ = 92236284. Its totient is φ = 15868544.

The previous prime is 39671417. The next prime is 39671441. The reversal of 39671440 is 4417693.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16516096 + 23155344 = 4064^2 + 4812^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 39671396 and 39671405.

It is not an unprimeable number, because it can be changed into a prime (39671441) 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, 247867 + ... + 248026.

Almost surely, 2^39671440 is an apocalyptic number.

It is an amenable number.

39671440 is an abundant number, since it is smaller than the sum of its proper divisors (52564844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39671440 is a wasteful number, since it uses less digits than its factorization.

39671440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495906 (or 495900 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 39671440 is about 6298.5268118823. The cubic root of 39671440 is about 341.0562309268.

The spelling of 39671440 in words is "thirty-nine million, six hundred seventy-one thousand, four hundred forty".