39947760 has 120 divisors (see below), whose sum is σ = 135620784. Its totient is φ = 10536960.

The previous prime is 39947759. The next prime is 39947771. The reversal of 39947760 is 6774993.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81115 + ... + 81605.

Almost surely, 2^39947760 is an apocalyptic number.

39947760 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39947760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67810392).

39947760 is an abundant number, since it is smaller than the sum of its proper divisors (95673024).

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

39947760 is a wasteful number, since it uses less digits than its factorization.

39947760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 39947760 is about 6320.4240364077. The cubic root of 39947760 is about 341.8462425693.

The spelling of 39947760 in words is "thirty-nine million, nine hundred forty-seven thousand, seven hundred sixty".