1978266904 has 16 divisors (see below), whose sum is σ = 3735937800. Its totient is φ = 982016832.

The previous prime is 1978266893. The next prime is 1978266919. The reversal of 1978266904 is 4096628791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888397 + ... + 890620.

Almost surely, 2^1978266904 is an apocalyptic number.

It is an amenable number.

1978266904 is a deficient number, since it is larger than the sum of its proper divisors (1757670896).

1978266904 is a wasteful number, since it uses less digits than its factorization.

1978266904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779162 (or 1779158 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 1978266904 is about 44477.7124411766. The cubic root of 1978266904 is about 1255.3407547588.

The spelling of 1978266904 in words is "one billion, nine hundred seventy-eight million, two hundred sixty-six thousand, nine hundred four".