1978607 has 4 divisors (see below), whose sum is σ = 1981680. Its totient is φ = 1975536.

The previous prime is 1978597. The next prime is 1978631. The reversal of 1978607 is 7068791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1978607 - 2⁴ = 1978591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978687) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 158 + ... + 1995.

It is an arithmetic number, because the mean of its divisors is an integer number (495420).

2^1978607 is an apocalyptic number.

1978607 is a deficient number, since it is larger than the sum of its proper divisors (3073).

1978607 is an equidigital number, since it uses as much as digits as its factorization.

1978607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 1978607 is about 1406.6296598608. The cubic root of 1978607 is about 125.5412688414.

The spelling of 1978607 in words is "one million, nine hundred seventy-eight thousand, six hundred seven".