1939777977 has 8 divisors (see below), whose sum is σ = 2617532064. Its totient is φ = 1277604608.

The previous prime is 1939777969. The next prime is 1939777997. The reversal of 1939777977 is 7797779391.

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 1939777977 - 2³ = 1939777969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1939777927) 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 7 ways as a sum of consecutive naturals, for example, 3894888 + ... + 3895385.

It is an arithmetic number, because the mean of its divisors is an integer number (327191508).

Almost surely, 2^1939777977 is an apocalyptic number.

It is an amenable number.

1939777977 is a deficient number, since it is larger than the sum of its proper divisors (677754087).

1939777977 is an equidigital number, since it uses as much as digits as its factorization.

1939777977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7790359.

The product of its digits is 36756909, while the sum is 66.

The square root of 1939777977 is about 44042.9106327000. The cubic root of 1939777977 is about 1247.1461243671.

The spelling of 1939777977 in words is "one billion, nine hundred thirty-nine million, seven hundred seventy-seven thousand, nine hundred seventy-seven".