3890781 has 8 divisors (see below), whose sum is σ = 5764160. Its totient is φ = 2593836.

The previous prime is 3890771. The next prime is 3890819. The reversal of 3890781 is 1870983.

It is a de Polignac number, because none of the positive numbers 2^k-3890781 is a prime.

It is a super-2 number, since 2×3890781² = 30276353579922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3890701) 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, 72025 + ... + 72078.

It is an arithmetic number, because the mean of its divisors is an integer number (720520).

Almost surely, 2^3890781 is an apocalyptic number.

It is an amenable number.

3890781 is a deficient number, since it is larger than the sum of its proper divisors (1873379).

3890781 is a wasteful number, since it uses less digits than its factorization.

3890781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144112 (or 144106 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 3890781 is about 1972.5062737543. The cubic root of 3890781 is about 157.2819658788.

The spelling of 3890781 in words is "three million, eight hundred ninety thousand, seven hundred eighty-one".