3855431 has 2 divisors, whose sum is σ = 3855432. Its totient is φ = 3855430.

The previous prime is 3855419. The next prime is 3855469. The reversal of 3855431 is 1345583.

It is a weak prime.

It is an emirp because it is prime and its reverse (1345583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3855431 - 2⁶ = 3855367 is a prime.

It is a super-2 number, since 2×3855431² = 29728696391522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3855394 and 3855403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3855331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1927715 + 1927716.

It is an arithmetic number, because the mean of its divisors is an integer number (1927716).

Almost surely, 2^3855431 is an apocalyptic number.

3855431 is a deficient number, since it is larger than the sum of its proper divisors (1).

3855431 is an equidigital number, since it uses as much as digits as its factorization.

3855431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 3855431 is about 1963.5251462612. The cubic root of 3855431 is about 156.8041833666.

It can be divided in two parts, 38 and 55431, that multiplied together give a triangular number (2106378 = T₂₀₅₂).

The spelling of 3855431 in words is "three million, eight hundred fifty-five thousand, four hundred thirty-one".