38191840 has 48 divisors (see below), whose sum is σ = 93350880. Its totient is φ = 14748160.

The previous prime is 38191817. The next prime is 38191841. The reversal of 38191840 is 4819183.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 38191796 and 38191805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38191841) 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, 525 + ... + 8755.

It is an arithmetic number, because the mean of its divisors is an integer number (1944810).

Almost surely, 2^38191840 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 38191840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46675440).

38191840 is an abundant number, since it is smaller than the sum of its proper divisors (55159040).

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

38191840 is a wasteful number, since it uses less digits than its factorization.

38191840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8275 (or 8267 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 38191840 is about 6179.9546923906. The cubic root of 38191840 is about 336.7623468644.

The spelling of 38191840 in words is "thirty-eight million, one hundred ninety-one thousand, eight hundred forty".