1990077894 has 48 divisors (see below), whose sum is σ = 4930448640. Its totient is φ = 568289520.

The previous prime is 1990077889. The next prime is 1990077937. The reversal of 1990077894 is 4987700991.

It is a self number, because there is not a number n which added to its sum of digits gives 1990077894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 348837 + ... + 354495.

It is an arithmetic number, because the mean of its divisors is an integer number (102717680).

Almost surely, 2^1990077894 is an apocalyptic number.

1990077894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1990077894 is an abundant number, since it is smaller than the sum of its proper divisors (2940370746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990077894 is a wasteful number, since it uses less digits than its factorization.

1990077894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465 (or 8462 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 1990077894 is about 44610.2891046449. The cubic root of 1990077894 is about 1257.8340831950.

The spelling of 1990077894 in words is "one billion, nine hundred ninety million, seventy-seven thousand, eight hundred ninety-four".