3950781 has 8 divisors (see below), whose sum is σ = 5277120. Its totient is φ = 2629152.

The previous prime is 3950777. The next prime is 3950809. The reversal of 3950781 is 1870593.

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

It is not a de Polignac number, because 3950781 - 2² = 3950777 is a prime.

It is a super-2 number, since 2×3950781² = 31217341019922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3950701) 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, 2041 + ... + 3473.

It is an arithmetic number, because the mean of its divisors is an integer number (659640).

Almost surely, 2^3950781 is an apocalyptic number.

It is an amenable number.

3950781 is a deficient number, since it is larger than the sum of its proper divisors (1326339).

3950781 is a wasteful number, since it uses less digits than its factorization.

3950781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 3950781 is about 1987.6571635974. The cubic root of 3950781 is about 158.0863305380.

The spelling of 3950781 in words is "three million, nine hundred fifty thousand, seven hundred eighty-one".