39897760 has 96 divisors (see below), whose sum is σ = 110073600. Its totient is φ = 13660416.

The previous prime is 39897751. The next prime is 39897761. The reversal of 39897760 is 6779893.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (39897761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54517 + ... + 55243.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^39897760 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 39897760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55036800).

39897760 is an abundant number, since it is smaller than the sum of its proper divisors (70175840).

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

39897760 is an equidigital number, since it uses as much as digits as its factorization.

39897760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 39897760 is about 6316.4673671286. The cubic root of 39897760 is about 341.7035608252.

The spelling of 39897760 in words is "thirty-nine million, eight hundred ninety-seven thousand, seven hundred sixty".