1978854977 has 8 divisors (see below), whose sum is σ = 2171679552. Its totient is φ = 1788185200.

The previous prime is 1978854973. The next prime is 1978855007. The reversal of 1978854977 is 7794588791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1978854977 - 2² = 1978854973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978854971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536774 + ... + 540447.

It is an arithmetic number, because the mean of its divisors is an integer number (271459944).

Almost surely, 2^1978854977 is an apocalyptic number.

It is an amenable number.

1978854977 is a deficient number, since it is larger than the sum of its proper divisors (192824575).

1978854977 is a wasteful number, since it uses less digits than its factorization.

1978854977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077399.

The product of its digits is 35562240, while the sum is 65.

The square root of 1978854977 is about 44484.3228227653. The cubic root of 1978854977 is about 1255.4651327962.

The spelling of 1978854977 in words is "one billion, nine hundred seventy-eight million, eight hundred fifty-four thousand, nine hundred seventy-seven".