39987900 has 108 divisors (see below), whose sum is σ = 126583912. Its totient is φ = 10558080.

The previous prime is 39987889. The next prime is 39987901. The reversal of 39987900 is 978993.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39987901) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 141159 + ... + 141441.

Almost surely, 2^39987900 is an apocalyptic number.

39987900 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 39987900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63291956).

39987900 is an abundant number, since it is smaller than the sum of its proper divisors (86596012).

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

39987900 is a wasteful number, since it uses less digits than its factorization.

39987900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 39987900 is about 6323.5986589916. The cubic root of 39987900 is about 341.9607013426.

The spelling of 39987900 in words is "thirty-nine million, nine hundred eighty-seven thousand, nine hundred".