10121778 has 24 divisors (see below), whose sum is σ = 22019088. Its totient is φ = 3360312.

The previous prime is 10121777. The next prime is 10121803. The reversal of 10121778 is 87712101.

It is not an unprimeable number, because it can be changed into a prime (10121777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4101 + ... + 6087.

It is an arithmetic number, because the mean of its divisors is an integer number (917462).

Almost surely, 2^10121778 is an apocalyptic number.

10121778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

10121778 is an abundant number, since it is smaller than the sum of its proper divisors (11897310).

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

10121778 is a wasteful number, since it uses less digits than its factorization.

10121778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278 (or 2275 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 10121778 is about 3181.4741865997. The cubic root of 10121778 is about 216.3144853184.

Adding to 10121778 its reverse (87712101), we get a palindrome (97833879).

The spelling of 10121778 in words is "ten million, one hundred twenty-one thousand, seven hundred seventy-eight".