1405423123 has 4 divisors (see below), whose sum is σ = 1513532608. Its totient is φ = 1297313640.

The previous prime is 1405423111. The next prime is 1405423153. The reversal of 1405423123 is 3213245041.

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 1405423123 - 2²¹ = 1403325971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405423153) 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, 54054723 + ... + 54054748.

It is an arithmetic number, because the mean of its divisors is an integer number (378383152).

Almost surely, 2^1405423123 is an apocalyptic number.

1405423123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1405423123 is a deficient number, since it is larger than the sum of its proper divisors (108109485).

1405423123 is a wasteful number, since it uses less digits than its factorization.

1405423123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108109484.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1405423123 is about 37488.9733521738. The cubic root of 1405423123 is about 1120.1315542219.

Adding to 1405423123 its reverse (3213245041), we get a palindrome (4618668164).

The spelling of 1405423123 in words is "one billion, four hundred five million, four hundred twenty-three thousand, one hundred twenty-three".