39987400 has 96 divisors (see below), whose sum is σ = 103788000. Its totient is φ = 14238720.

The previous prime is 39987379. The next prime is 39987403. The reversal of 39987400 is 478993.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (39987403) 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, 64291 + ... + 64909.

It is an arithmetic number, because the mean of its divisors is an integer number (1081125).

Almost surely, 2^39987400 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 39987400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51894000).

39987400 is an abundant number, since it is smaller than the sum of its proper divisors (63800600).

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

39987400 is a wasteful number, since it uses less digits than its factorization.

39987400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 39987400 is about 6323.5591244172. The cubic root of 39987400 is about 341.9592760693.

The spelling of 39987400 in words is "thirty-nine million, nine hundred eighty-seven thousand, four hundred".