1978604 has 6 divisors (see below), whose sum is σ = 3462564. Its totient is φ = 989300.

The previous prime is 1978597. The next prime is 1978631. The reversal of 1978604 is 4068791.

1978604 = T₃₉₄ + T₃₉₅ + ... + T₄₁₇.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247322 + ... + 247329.

It is an arithmetic number, because the mean of its divisors is an integer number (577094).

2^1978604 is an apocalyptic number.

It is an amenable number.

1978604 is a deficient number, since it is larger than the sum of its proper divisors (1483960).

1978604 is a wasteful number, since it uses less digits than its factorization.

1978604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494655 (or 494653 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1978604 is about 1406.6285934816. The cubic root of 1978604 is about 125.5412053920.

The spelling of 1978604 in words is "one million, nine hundred seventy-eight thousand, six hundred four".