3551638 has 4 divisors (see below), whose sum is σ = 5327460. Its totient is φ = 1775818.

The previous prime is 3551629. The next prime is 3551641. The reversal of 3551638 is 8361553.

3551638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8361553 = 127 ⋅65839.

It is a super-2 number, since 2×3551638² = 25228264966088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 887908 + ... + 887911.

It is an arithmetic number, because the mean of its divisors is an integer number (1331865).

Almost surely, 2^3551638 is an apocalyptic number.

3551638 is a deficient number, since it is larger than the sum of its proper divisors (1775822).

3551638 is a wasteful number, since it uses less digits than its factorization.

3551638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775821.

The product of its digits is 10800, while the sum is 31.

The square root of 3551638 is about 1884.5789980789. The cubic root of 3551638 is about 152.5724890529.

The spelling of 3551638 in words is "three million, five hundred fifty-one thousand, six hundred thirty-eight".