3551646 has 32 divisors (see below), whose sum is σ = 8206848. Its totient is φ = 1003680.

The previous prime is 3551641. The next prime is 3551663. The reversal of 3551646 is 6461553.

It is a super-2 number, since 2×3551646² = 25228378618632, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3551641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3916 + ... + 4736.

It is an arithmetic number, because the mean of its divisors is an integer number (256464).

Almost surely, 2^3551646 is an apocalyptic number.

3551646 is an abundant number, since it is smaller than the sum of its proper divisors (4655202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3551646 is a wasteful number, since it uses less digits than its factorization.

3551646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936.

The product of its digits is 10800, while the sum is 30.

The square root of 3551646 is about 1884.5811205676. The cubic root of 3551646 is about 152.5726036084.

It can be divided in two parts, 35 and 51646, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 3551646 in words is "three million, five hundred fifty-one thousand, six hundred forty-six".