3658978 has 16 divisors (see below), whose sum is σ = 6065280. Its totient is φ = 1646656.

The previous prime is 3658943. The next prime is 3658981. The reversal of 3658978 is 8798563.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1558 + ... + 3121.

It is an arithmetic number, because the mean of its divisors is an integer number (379080).

Almost surely, 2^3658978 is an apocalyptic number.

3658978 is a deficient number, since it is larger than the sum of its proper divisors (2406302).

3658978 is a wasteful number, since it uses less digits than its factorization.

3658978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721.

The product of its digits is 362880, while the sum is 46.

The square root of 3658978 is about 1912.8455243432. The cubic root of 3658978 is about 154.0943089062.

The spelling of 3658978 in words is "three million, six hundred fifty-eight thousand, nine hundred seventy-eight".