39390340 has 72 divisors (see below), whose sum is σ = 93375576. Its totient is φ = 13939200.

The previous prime is 39390319. The next prime is 39390341. The reversal of 39390340 is 4309393.

It can be written as a sum of positive squares in 4 ways, for example, as 627264 + 38763076 = 792^2 + 6226^2 .

It is not an unprimeable number, because it can be changed into a prime (39390341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99022 + ... + 99418.

It is an arithmetic number, because the mean of its divisors is an integer number (1296883).

Almost surely, 2^39390340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39390340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46687788).

39390340 is an abundant number, since it is smaller than the sum of its proper divisors (53985236).

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

39390340 is a wasteful number, since it uses less digits than its factorization.

39390340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 39390340 is about 6276.1724004364. The cubic root of 39390340 is about 340.2487798597.

The spelling of 39390340 in words is "thirty-nine million, three hundred ninety thousand, three hundred forty".