3213657 has 6 divisors (see below), whose sum is σ = 4641962. Its totient is φ = 2142432.

The previous prime is 3213619. The next prime is 3213659. The reversal of 3213657 is 7563123.

It is a happy number.

3213657 is a `hidden beast` number, since 3 + 2 + 1 + 3 + 657 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1648656 + 1565001 = 1284^2 + 1251^2 .

It is not a de Polignac number, because 3213657 - 2⁶ = 3213593 is a prime.

It is a d-powerful number, because it can be written as 3¹³ + 2¹³ + 1 + 3¹³ + 6 + 5 + 7⁵ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3213657.

It is not an unprimeable number, because it can be changed into a prime (3213659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178528 + ... + 178545.

Almost surely, 2^3213657 is an apocalyptic number.

It is an amenable number.

3213657 is a deficient number, since it is larger than the sum of its proper divisors (1428305).

3213657 is a wasteful number, since it uses less digits than its factorization.

3213657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357079 (or 357076 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 3213657 is about 1792.6675653896. The cubic root of 3213657 is about 147.5705991630.

It can be divided in two parts, 32 and 13657, that added together give a square (13689 = 117²).

The spelling of 3213657 in words is "three million, two hundred thirteen thousand, six hundred fifty-seven".