39780740 has 24 divisors (see below), whose sum is σ = 85118040. Its totient is φ = 15611648.

The previous prime is 39780707. The next prime is 39780743. The reversal of 39780740 is 4708793.

It can be written as a sum of positive squares in 4 ways, for example, as 643204 + 39137536 = 802^2 + 6256^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39780694 and 39780703.

It is not an unprimeable number, because it can be changed into a prime (39780743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17705 + ... + 19824.

It is an arithmetic number, because the mean of its divisors is an integer number (3546585).

Almost surely, 2^39780740 is an apocalyptic number.

It is an amenable number.

39780740 is an abundant number, since it is smaller than the sum of its proper divisors (45337300).

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

39780740 is a wasteful number, since it uses less digits than its factorization.

39780740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37591 (or 37589 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 39780740 is about 6307.1974759001. The cubic root of 39780740 is about 341.3691618715.

The spelling of 39780740 in words is "thirty-nine million, seven hundred eighty thousand, seven hundred forty".