1978007 has 4 divisors (see below), whose sum is σ = 1981056. Its totient is φ = 1974960.

The previous prime is 1977991. The next prime is 1978021. The reversal of 1978007 is 7008791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7008791 = 773 ⋅9067.

It is a cyclic number.

It is not a de Polignac number, because 1978007 - 2⁴ = 1977991 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 (1978027) 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, 119 + ... + 1992.

It is an arithmetic number, because the mean of its divisors is an integer number (495264).

2^1978007 is an apocalyptic number.

1978007 is a deficient number, since it is larger than the sum of its proper divisors (3049).

1978007 is an equidigital number, since it uses as much as digits as its factorization.

1978007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1978007 is about 1406.4163679366. The cubic root of 1978007 is about 125.5285776944.

The spelling of 1978007 in words is "one million, nine hundred seventy-eight thousand, seven".