1990977814 has 48 divisors (see below), whose sum is σ = 3814255008. Its totient is φ = 760783104.

The previous prime is 1990977809. The next prime is 1990977817. The reversal of 1990977814 is 4187790991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990977817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74332 + ... + 97504.

It is an arithmetic number, because the mean of its divisors is an integer number (79463646).

Almost surely, 2^1990977814 is an apocalyptic number.

1990977814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1990977814 is a deficient number, since it is larger than the sum of its proper divisors (1823277194).

1990977814 is a wasteful number, since it uses less digits than its factorization.

1990977814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23237 (or 23218 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 55.

The square root of 1990977814 is about 44620.3744269364. The cubic root of 1990977814 is about 1258.0236535749.

The spelling of 1990977814 in words is "one billion, nine hundred ninety million, nine hundred seventy-seven thousand, eight hundred fourteen".