1100400123 has 16 divisors (see below), whose sum is σ = 1563048576. Its totient is φ = 686206080.

The previous prime is 1100400121. The next prime is 1100400127. The reversal of 1100400123 is 3210040011.

It is a happy number.

It is not a de Polignac number, because 1100400123 - 2¹ = 1100400121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100400099 and 1100400108.

It is not an unprimeable number, because it can be changed into a prime (1100400121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57873 + ... + 74498.

It is an arithmetic number, because the mean of its divisors is an integer number (97690536).

Almost surely, 2^1100400123 is an apocalyptic number.

1100400123 is a deficient number, since it is larger than the sum of its proper divisors (462648453).

1100400123 is a wasteful number, since it uses less digits than its factorization.

1100400123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132554.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1100400123 is about 33172.2794363004. The cubic root of 1100400123 is about 1032.4052636218.

Adding to 1100400123 its reverse (3210040011), we get a palindrome (4310440134).

The spelling of 1100400123 in words is "one billion, one hundred million, four hundred thousand, one hundred twenty-three".