1990973655 has 32 divisors (see below), whose sum is σ = 3861285120. Its totient is φ = 965319840.

The previous prime is 1990973651. The next prime is 1990973657. The reversal of 1990973655 is 5563790991.

1990973655 is a `hidden beast` number, since 199 + 0 + 97 + 365 + 5 = 666.

It is not a de Polignac number, because 1990973655 - 2² = 1990973651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990973651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 668877 + ... + 671846.

It is an arithmetic number, because the mean of its divisors is an integer number (120665160).

Almost surely, 2^1990973655 is an apocalyptic number.

1990973655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1990973655 is a deficient number, since it is larger than the sum of its proper divisors (1870311465).

1990973655 is a wasteful number, since it uses less digits than its factorization.

1990973655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340748 (or 1340742 counting only the distinct ones).

The product of its (nonzero) digits is 2296350, while the sum is 54.

The square root of 1990973655 is about 44620.3278226416. The cubic root of 1990973655 is about 1258.0227776027.

The spelling of 1990973655 in words is "one billion, nine hundred ninety million, nine hundred seventy-three thousand, six hundred fifty-five".