39388890 has 16 divisors (see below), whose sum is σ = 94533408. Its totient is φ = 10503696.

The previous prime is 39388861. The next prime is 39388891. The reversal of 39388890 is 9888393.

It is a super-3 number, since 3×39388890³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (39388891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656452 + ... + 656511.

It is an arithmetic number, because the mean of its divisors is an integer number (5908338).

Almost surely, 2^39388890 is an apocalyptic number.

39388890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

39388890 is an abundant number, since it is smaller than the sum of its proper divisors (55144518).

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

39388890 is a wasteful number, since it uses less digits than its factorization.

39388890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312973.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 39388890 is about 6276.0568831074. The cubic root of 39388890 is about 340.2446048362.

The spelling of 39388890 in words is "thirty-nine million, three hundred eighty-eight thousand, eight hundred ninety".