39685890 has 64 divisors (see below), whose sum is σ = 99348480. Its totient is φ = 10134720.

The previous prime is 39685873. The next prime is 39685913. The reversal of 39685890 is 9858693.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129117 + ... + 129423.

It is an arithmetic number, because the mean of its divisors is an integer number (1552320).

Almost surely, 2^39685890 is an apocalyptic number.

39685890 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 39685890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49674240).

39685890 is an abundant number, since it is smaller than the sum of its proper divisors (59662590).

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

39685890 is a wasteful number, since it uses less digits than its factorization.

39685890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 39685890 is about 6299.6738010789. The cubic root of 39685890 is about 341.0976348880.

The spelling of 39685890 in words is "thirty-nine million, six hundred eighty-five thousand, eight hundred ninety".