38456781 has 8 divisors (see below), whose sum is σ = 55937184. Its totient is φ = 23307120.

The previous prime is 38456767. The next prime is 38456791. The reversal of 38456781 is 18765483.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38456781 - 2⁹ = 38456269 is a prime.

It is a super-2 number, since 2×38456781² = 2957848009763922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38456791) 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, 582646 + ... + 582711.

It is an arithmetic number, because the mean of its divisors is an integer number (6992148).

Almost surely, 2^38456781 is an apocalyptic number.

It is an amenable number.

38456781 is a deficient number, since it is larger than the sum of its proper divisors (17480403).

38456781 is a wasteful number, since it uses less digits than its factorization.

38456781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165371.

The product of its digits is 161280, while the sum is 42.

The square root of 38456781 is about 6201.3531587872. The cubic root of 38456781 is about 337.5392722476.

The spelling of 38456781 in words is "thirty-eight million, four hundred fifty-six thousand, seven hundred eighty-one".