120400111 has 4 divisors (see below), whose sum is σ = 129661672. Its totient is φ = 111138552.

The previous prime is 120400081. The next prime is 120400117. The reversal of 120400111 is 111004021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 120400111 - 2⁵ = 120400079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120400117) 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, 4630761 + ... + 4630786.

It is an arithmetic number, because the mean of its divisors is an integer number (32415418).

Almost surely, 2^120400111 is an apocalyptic number.

120400111 is a deficient number, since it is larger than the sum of its proper divisors (9261561).

120400111 is an equidigital number, since it uses as much as digits as its factorization.

120400111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9261560.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 120400111 is about 10972.6984374856. The cubic root of 120400111 is about 493.7900059236.

Adding to 120400111 its reverse (111004021), we get a palindrome (231404132).

The spelling of 120400111 in words is "one hundred twenty million, four hundred thousand, one hundred eleven".