3640069 has 4 divisors (see below), whose sum is σ = 3672396. Its totient is φ = 3607744.

The previous prime is 3640061. The next prime is 3640073. The reversal of 3640069 is 9600463.

3640069 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: 9600463 = 1021 ⋅9403.

It can be written as a sum of positive squares in 2 ways, for example, as 1595169 + 2044900 = 1263^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640069 - 2³ = 3640061 is a prime.

It is a super-2 number, since 2×3640069² = 26500204649522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

3640069 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640061) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 15994 + ... + 16219.

It is an arithmetic number, because the mean of its divisors is an integer number (918099).

Almost surely, 2^3640069 is an apocalyptic number.

It is an amenable number.

3640069 is a deficient number, since it is larger than the sum of its proper divisors (32327).

3640069 is a wasteful number, since it uses less digits than its factorization.

3640069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32326.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 3640069 is about 1907.8964856616. The cubic root of 3640069 is about 153.8284056000.

The spelling of 3640069 in words is "three million, six hundred forty thousand, sixty-nine".