3678949 has 2 divisors, whose sum is σ = 3678950. Its totient is φ = 3678948.

The previous prime is 3678943. The next prime is 3678967. The reversal of 3678949 is 9498763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3678724 + 225 = 1918^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 3678949 - 2⁷ = 3678821 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 3678899 and 3678908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3678943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1839474 + 1839475.

It is an arithmetic number, because the mean of its divisors is an integer number (1839475).

Almost surely, 2^3678949 is an apocalyptic number.

It is an amenable number.

3678949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3678949 is an equidigital number, since it uses as much as digits as its factorization.

3678949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 3678949 is about 1918.0586539520. The cubic root of 3678949 is about 154.3741534809.

It can be divided in two parts, 367 and 8949, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 3678949 in words is "three million, six hundred seventy-eight thousand, nine hundred forty-nine".