38878440 has 32 divisors (see below), whose sum is σ = 116635680. Its totient is φ = 10367552.

The previous prime is 38878417. The next prime is 38878471. The reversal of 38878440 is 4487883.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 38878392 and 38878401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161874 + ... + 162113.

It is an arithmetic number, because the mean of its divisors is an integer number (3644865).

Almost surely, 2^38878440 is an apocalyptic number.

38878440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38878440 is an abundant number, since it is smaller than the sum of its proper divisors (77757240).

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

38878440 is a wasteful number, since it uses less digits than its factorization.

38878440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324001 (or 323997 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 38878440 is about 6235.2578134348. The cubic root of 38878440 is about 338.7684394224.

The spelling of 38878440 in words is "thirty-eight million, eight hundred seventy-eight thousand, four hundred forty".