1801920195 has 32 divisors (see below), whose sum is σ = 3372019200. Its totient is φ = 910442592.

The previous prime is 1801920187. The next prime is 1801920199. The reversal of 1801920195 is 5910291081.

It is not a de Polignac number, because 1801920195 - 2³ = 1801920187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1801920199) 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, 348687 + ... + 353816.

It is an arithmetic number, because the mean of its divisors is an integer number (105375600).

Almost surely, 2^1801920195 is an apocalyptic number.

1801920195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1801920195 is a deficient number, since it is larger than the sum of its proper divisors (1570099005).

1801920195 is a wasteful number, since it uses less digits than its factorization.

1801920195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702536 (or 702530 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1801920195 is about 42449.0305543012. The cubic root of 1801920195 is about 1216.8728014614.

The spelling of 1801920195 in words is "one billion, eight hundred one million, nine hundred twenty thousand, one hundred ninety-five".