39219990 has 64 divisors (see below), whose sum is σ = 100396800. Its totient is φ = 9777024.

The previous prime is 39219979. The next prime is 39219997. The reversal of 39219990 is 9991293.

It is a happy number.

39219990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39219997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46896 + ... + 47724.

It is an arithmetic number, because the mean of its divisors is an integer number (1568700).

Almost surely, 2^39219990 is an apocalyptic number.

39219990 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 39219990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50198400).

39219990 is an abundant number, since it is smaller than the sum of its proper divisors (61176810).

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

39219990 is a wasteful number, since it uses less digits than its factorization.

With its successor (39219991) it forms an eRAP, since the sums of their prime factors are consecutive (941 and 942).

39219990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 39219990 is about 6262.5865263484. The cubic root of 39219990 is about 339.7575838331.

The spelling of 39219990 in words is "thirty-nine million, two hundred nineteen thousand, nine hundred ninety".