4640978 has 8 divisors (see below), whose sum is σ = 7327920. Its totient is φ = 2198340.

The previous prime is 4640971. The next prime is 4640981. The reversal of 4640978 is 8790464.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 122131 = 4640978 / (4 + 6 + 4 + 0 + 9 + 7 + 8).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (4640971) 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, 61028 + ... + 61103.

It is an arithmetic number, because the mean of its divisors is an integer number (915990).

Almost surely, 2^4640978 is an apocalyptic number.

4640978 is a deficient number, since it is larger than the sum of its proper divisors (2686942).

4640978 is a wasteful number, since it uses less digits than its factorization.

4640978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122152.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 4640978 is about 2154.2929234438. The cubic root of 4640978 is about 166.8027359917.

The spelling of 4640978 in words is "four million, six hundred forty thousand, nine hundred seventy-eight".