199701945 has 24 divisors (see below), whose sum is σ = 347083776. Its totient is φ = 106220448.

The previous prime is 199701937. The next prime is 199701979. The reversal of 199701945 is 549107991.

It is not a de Polignac number, because 199701945 - 2³ = 199701937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199701945.

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, 11442 + ... + 23028.

It is an arithmetic number, because the mean of its divisors is an integer number (14461824).

Almost surely, 2^199701945 is an apocalyptic number.

199701945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199701945 is a deficient number, since it is larger than the sum of its proper divisors (147381831).

199701945 is a wasteful number, since it uses less digits than its factorization.

199701945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11981 (or 11978 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 199701945 is about 14131.5938591512. The cubic root of 199701945 is about 584.5128971760.

The spelling of 199701945 in words is "one hundred ninety-nine million, seven hundred one thousand, nine hundred forty-five".