1955209900 has 36 divisors (see below), whose sum is σ = 4848922288. Its totient is φ = 670357440.

The previous prime is 1955209849. The next prime is 1955209903. The reversal of 1955209900 is 99025591.

It is not an unprimeable number, because it can be changed into a prime (1955209903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1395879 + ... + 1397278.

Almost surely, 2^1955209900 is an apocalyptic number.

1955209900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1955209900 is an abundant number, since it is smaller than the sum of its proper divisors (2893712388).

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

1955209900 is a wasteful number, since it uses less digits than its factorization.

1955209900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793178 (or 2793171 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 1955209900 is about 44217.7554835159. The cubic root of 1955209900 is about 1250.4446204980. Note that the first 3 decimals are identical.

The spelling of 1955209900 in words is "one billion, nine hundred fifty-five million, two hundred nine thousand, nine hundred".