39039990 has 64 divisors (see below), whose sum is σ = 108241920. Its totient is φ = 8906240.

The previous prime is 39039971. The next prime is 39039991. The reversal of 39039990 is 9993093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39039991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2131 + ... + 9089.

It is an arithmetic number, because the mean of its divisors is an integer number (1691280).

Almost surely, 2^39039990 is an apocalyptic number.

39039990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 39039990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54120960).

39039990 is an abundant number, since it is smaller than the sum of its proper divisors (69201930).

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

39039990 is a wasteful number, since it uses less digits than its factorization.

39039990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997.

The product of its (nonzero) digits is 59049, while the sum is 42.

The square root of 39039990 is about 6248.1989404948. The cubic root of 39039990 is about 339.2370145746.

The spelling of 39039990 in words is "thirty-nine million, thirty-nine thousand, nine hundred ninety".