3857631 has 4 divisors (see below), whose sum is σ = 5143512. Its totient is φ = 2571752.

The previous prime is 3857621. The next prime is 3857641. The reversal of 3857631 is 1367583.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3857621) and next prime (3857641).

It is a cyclic number.

It is not a de Polignac number, because 3857631 - 2¹⁰ = 3856607 is a prime.

It is a super-2 number, since 2×3857631² = 29762633864322, which contains 22 as substring.

It is a D-number.

3857631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3857592 and 3857601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857611) 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, 642936 + ... + 642941.

It is an arithmetic number, because the mean of its divisors is an integer number (1285878).

Almost surely, 2^3857631 is an apocalyptic number.

3857631 is a deficient number, since it is larger than the sum of its proper divisors (1285881).

3857631 is a wasteful number, since it uses less digits than its factorization.

3857631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285880.

The product of its digits is 15120, while the sum is 33.

The square root of 3857631 is about 1964.0852832807. The cubic root of 3857631 is about 156.8340030857.

The spelling of 3857631 in words is "three million, eight hundred fifty-seven thousand, six hundred thirty-one".