3649997 has 4 divisors (see below), whose sum is σ = 3930780. Its totient is φ = 3369216.

The previous prime is 3649993. The next prime is 3649999. The reversal of 3649997 is 7999463.

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

It can be written as a sum of positive squares in 2 ways, for example, as 729316 + 2920681 = 854^2 + 1709^2 .

It is a cyclic number.

It is not a de Polignac number, because 3649997 - 2² = 3649993 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649993) 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, 140372 + ... + 140397.

It is an arithmetic number, because the mean of its divisors is an integer number (982695).

Almost surely, 2^3649997 is an apocalyptic number.

It is an amenable number.

3649997 is a deficient number, since it is larger than the sum of its proper divisors (280783).

3649997 is a wasteful number, since it uses less digits than its factorization.

3649997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280782.

The product of its digits is 367416, while the sum is 47.

The square root of 3649997 is about 1910.4965323182. The cubic root of 3649997 is about 153.9681302466.

The spelling of 3649997 in words is "three million, six hundred forty-nine thousand, nine hundred ninety-seven".