38731440 has 160 divisors (see below), whose sum is σ = 138848256. Its totient is φ = 8826880.

The previous prime is 38731439. The next prime is 38731453. The reversal of 38731440 is 4413783.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 38731398 and 38731407.

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, 44449 + ... + 45311.

Almost surely, 2^38731440 is an apocalyptic number.

38731440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38731440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69424128).

38731440 is an abundant number, since it is smaller than the sum of its proper divisors (100116816).

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

38731440 is a wasteful number, since it uses less digits than its factorization.

38731440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 38731440 is about 6223.4588453689. The cubic root of 38731440 is about 338.3409372187.

The spelling of 38731440 in words is "thirty-eight million, seven hundred thirty-one thousand, four hundred forty".