3642649 has 2 divisors, whose sum is σ = 3642650. Its totient is φ = 3642648.

The previous prime is 3642643. The next prime is 3642673. The reversal of 3642649 is 9462463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3385600 + 257049 = 1840^2 + 507^2 .

It is a cyclic number.

It is not a de Polignac number, because 3642649 - 2¹³ = 3634457 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3642643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821324 + 1821325.

It is an arithmetic number, because the mean of its divisors is an integer number (1821325).

Almost surely, 2^3642649 is an apocalyptic number.

It is an amenable number.

3642649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3642649 is an equidigital number, since it uses as much as digits as its factorization.

3642649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 34.

The square root of 3642649 is about 1908.5725032076. The cubic root of 3642649 is about 153.8647404019.

The spelling of 3642649 in words is "three million, six hundred forty-two thousand, six hundred forty-nine".