39561220 has 24 divisors (see below), whose sum is σ = 85944600. Its totient is φ = 15278592.

The previous prime is 39561209. The next prime is 39561259. The reversal of 39561220 is 2216593.

It can be written as a sum of positive squares in 4 ways, for example, as 3944196 + 35617024 = 1986^2 + 5968^2 .

It is a super-6 number, since 6×39561220⁶ (a number of 47 digits) contains 666666 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33525 + ... + 34684.

It is an arithmetic number, because the mean of its divisors is an integer number (3581025).

Almost surely, 2^39561220 is an apocalyptic number.

It is an amenable number.

39561220 is an abundant number, since it is smaller than the sum of its proper divisors (46383380).

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

39561220 is a wasteful number, since it uses less digits than its factorization.

39561220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68247 (or 68245 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 39561220 is about 6289.7710610165. The cubic root of 39561220 is about 340.7400833817.

The spelling of 39561220 in words is "thirty-nine million, five hundred sixty-one thousand, two hundred twenty".