1405134638 has 4 divisors (see below), whose sum is σ = 2107701960. Its totient is φ = 702567318.

The previous prime is 1405134637. The next prime is 1405134671. The reversal of 1405134638 is 8364315041.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1405134598 and 1405134607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405134637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 351283658 + ... + 351283661.

It is an arithmetic number, because the mean of its divisors is an integer number (526925490).

Almost surely, 2^1405134638 is an apocalyptic number.

1405134638 is a deficient number, since it is larger than the sum of its proper divisors (702567322).

1405134638 is an equidigital number, since it uses as much as digits as its factorization.

1405134638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702567321.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1405134638 is about 37485.1255566791. The cubic root of 1405134638 is about 1120.0549074910.

Adding to 1405134638 its reverse (8364315041), we get a palindrome (9769449679).

The spelling of 1405134638 in words is "one billion, four hundred five million, one hundred thirty-four thousand, six hundred thirty-eight".