195777940 has 12 divisors (see below), whose sum is σ = 411133716. Its totient is φ = 78311168.

The previous prime is 195777937. The next prime is 195777943. The reversal of 195777940 is 49777591.

It is an interprime number because it is at equal distance from previous prime (195777937) and next prime (195777943).

It can be written as a sum of positive squares in 2 ways, for example, as 64995844 + 130782096 = 8062^2 + 11436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195777943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4894429 + ... + 4894468.

It is an arithmetic number, because the mean of its divisors is an integer number (34261143).

Almost surely, 2^195777940 is an apocalyptic number.

195777940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195777940 is an abundant number, since it is smaller than the sum of its proper divisors (215355776).

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

195777940 is a wasteful number, since it uses less digits than its factorization.

195777940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9788906 (or 9788904 counting only the distinct ones).

The product of its (nonzero) digits is 555660, while the sum is 49.

The square root of 195777940 is about 13992.0670381470. The cubic root of 195777940 is about 580.6591198868.

It can be divided in two parts, 1957 and 77940, that added together give a palindrome (79897).

The spelling of 195777940 in words is "one hundred ninety-five million, seven hundred seventy-seven thousand, nine hundred forty".