3901831 has 4 divisors (see below), whose sum is σ = 3919552. Its totient is φ = 3884112.

The previous prime is 3901829. The next prime is 3901837. The reversal of 3901831 is 1381093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1381093 = 7 ⋅197299.

It is a cyclic number.

It is not a de Polignac number, because 3901831 - 2¹ = 3901829 is a prime.

It is a super-2 number, since 2×3901831² = 30448570305122, which contains 22 as substring.

It is a Duffinian number.

3901831 is a lucky number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 3901796 and 3901805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3901837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8526 + ... + 8971.

It is an arithmetic number, because the mean of its divisors is an integer number (979888).

Almost surely, 2^3901831 is an apocalyptic number.

3901831 is a deficient number, since it is larger than the sum of its proper divisors (17721).

3901831 is a wasteful number, since it uses less digits than its factorization.

3901831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17720.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 3901831 is about 1975.3052928598. The cubic root of 3901831 is about 157.4307211898.

The spelling of 3901831 in words is "three million, nine hundred one thousand, eight hundred thirty-one".