42400111 has 4 divisors (see below), whose sum is σ = 45661672. Its totient is φ = 39138552.

The previous prime is 42400087. The next prime is 42400121. The reversal of 42400111 is 11100424.

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 42400111 - 2⁷ = 42399983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 3261547 = 42400111 / (4 + 2 + 4 + 0 + 0 + 1 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42400091 and 42400100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42400121) 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, 1630761 + ... + 1630786.

It is an arithmetic number, because the mean of its divisors is an integer number (11415418).

Almost surely, 2^42400111 is an apocalyptic number.

42400111 is a deficient number, since it is larger than the sum of its proper divisors (3261561).

42400111 is a wasteful number, since it uses less digits than its factorization.

42400111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261560.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 42400111 is about 6511.5367617791. The cubic root of 42400111 is about 348.7029845452.

Adding to 42400111 its reverse (11100424), we get a palindrome (53500535).

The spelling of 42400111 in words is "forty-two million, four hundred thousand, one hundred eleven".