1978949147 has 16 divisors (see below), whose sum is σ = 2314137600. Its totient is φ = 1657017888.

The previous prime is 1978949143. The next prime is 1978949153. The reversal of 1978949147 is 7419498791.

It is a cyclic number.

It is not a de Polignac number, because 1978949147 - 2² = 1978949143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978949143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177854 + ... + 188652.

It is an arithmetic number, because the mean of its divisors is an integer number (144633600).

Almost surely, 2^1978949147 is an apocalyptic number.

1978949147 is a deficient number, since it is larger than the sum of its proper divisors (335188453).

1978949147 is a wasteful number, since it uses less digits than its factorization.

1978949147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11410.

The product of its digits is 4572288, while the sum is 59.

The square root of 1978949147 is about 44485.3812729530. The cubic root of 1978949147 is about 1255.4850475580.

The spelling of 1978949147 in words is "one billion, nine hundred seventy-eight million, nine hundred forty-nine thousand, one hundred forty-seven".