38991785 has 16 divisors (see below), whose sum is σ = 55800576. Its totient is φ = 25574208.

The previous prime is 38991767. The next prime is 38991803. The reversal of 38991785 is 58719983.

It is an interprime number because it is at equal distance from previous prime (38991767) and next prime (38991803).

It is a cyclic number.

It is not a de Polignac number, because 38991785 - 2¹⁶ = 38926249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23414 + ... + 25023.

It is an arithmetic number, because the mean of its divisors is an integer number (3487536).

Almost surely, 2^38991785 is an apocalyptic number.

38991785 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

38991785 is a deficient number, since it is larger than the sum of its proper divisors (16808791).

38991785 is a wasteful number, since it uses less digits than its factorization.

38991785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48472.

The product of its digits is 544320, while the sum is 50.

The square root of 38991785 is about 6244.3402373670. The cubic root of 38991785 is about 339.0973316875.

The spelling of 38991785 in words is "thirty-eight million, nine hundred ninety-one thousand, seven hundred eighty-five".