39947240 has 16 divisors (see below), whose sum is σ = 89881380. Its totient is φ = 15978880.

The previous prime is 39947231. The next prime is 39947249. The reversal of 39947240 is 4274993.

It is an interprime number because it is at equal distance from previous prime (39947231) and next prime (39947249).

It can be written as a sum of positive squares in 2 ways, for example, as 38167684 + 1779556 = 6178^2 + 1334^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39947194 and 39947203.

It is not an unprimeable number, because it can be changed into a prime (39947249) 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, 499301 + ... + 499380.

Almost surely, 2^39947240 is an apocalyptic number.

It is an amenable number.

39947240 is an abundant number, since it is smaller than the sum of its proper divisors (49934140).

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

39947240 is a wasteful number, since it uses less digits than its factorization.

39947240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998692 (or 998688 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 39947240 is about 6320.3828997933. The cubic root of 39947240 is about 341.8447592920.

The spelling of 39947240 in words is "thirty-nine million, nine hundred forty-seven thousand, two hundred forty".