38781457 has 16 divisors (see below), whose sum is σ = 46021248. Its totient is φ = 32215680.

The previous prime is 38781443. The next prime is 38781499. The reversal of 38781457 is 75418783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38781457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38781857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13413 + ... + 16045.

It is an arithmetic number, because the mean of its divisors is an integer number (2876328).

Almost surely, 2^38781457 is an apocalyptic number.

It is an amenable number.

38781457 is a deficient number, since it is larger than the sum of its proper divisors (7239791).

38781457 is a wasteful number, since it uses less digits than its factorization.

38781457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760.

The product of its digits is 188160, while the sum is 43.

The square root of 38781457 is about 6227.4759734583. The cubic root of 38781457 is about 338.4865167900.

It can be divided in two parts, 3878 and 1457, that added together give a palindrome (5335).

The spelling of 38781457 in words is "thirty-eight million, seven hundred eighty-one thousand, four hundred fifty-seven".