3918649 has 4 divisors (see below), whose sum is σ = 4478464. Its totient is φ = 3358836.

The previous prime is 3918641. The next prime is 3918667. The reversal of 3918649 is 9468193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9468193 = 7 ⋅1352599.

It is a cyclic number.

It is not a de Polignac number, because 3918649 - 2³ = 3918641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3918641) 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, 279897 + ... + 279910.

It is an arithmetic number, because the mean of its divisors is an integer number (1119616).

Almost surely, 2^3918649 is an apocalyptic number.

It is an amenable number.

3918649 is a deficient number, since it is larger than the sum of its proper divisors (559815).

3918649 is an equidigital number, since it uses as much as digits as its factorization.

3918649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559814.

The product of its digits is 46656, while the sum is 40.

The square root of 3918649 is about 1979.5577788991. The cubic root of 3918649 is about 157.6565873607.

The spelling of 3918649 in words is "three million, nine hundred eighteen thousand, six hundred forty-nine".