38439940 has 96 divisors (see below), whose sum is σ = 102009600. Its totient is φ = 11819520.

The previous prime is 38439931. The next prime is 38439949. The reversal of 38439940 is 4993483.

It is an interprime number because it is at equal distance from previous prime (38439931) and next prime (38439949).

It is a junction number, because it is equal to n+sod(n) for n = 38439893 and 38439902.

It is not an unprimeable number, because it can be changed into a prime (38439949) 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, 167746 + ... + 167974.

It is an arithmetic number, because the mean of its divisors is an integer number (1062600).

Almost surely, 2^38439940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38439940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51004800).

38439940 is an abundant number, since it is smaller than the sum of its proper divisors (63569660).

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

38439940 is a wasteful number, since it uses less digits than its factorization.

38439940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 38439940 is about 6199.9951612884. The cubic root of 38439940 is about 337.4899933018.

The spelling of 38439940 in words is "thirty-eight million, four hundred thirty-nine thousand, nine hundred forty".