1238405 has 16 divisors (see below), whose sum is σ = 1741824. Its totient is φ = 827520.

The previous prime is 1238383. The next prime is 1238407. The reversal of 1238405 is 5048321.

1238405 = T₂₂₅ + T₂₂₆ + ... + T₂₆₅.

It is not a de Polignac number, because 1238405 - 2¹² = 1234309 is a prime.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004 + ... + 1866.

It is an arithmetic number, because the mean of its divisors is an integer number (108864).

2^1238405 is an apocalyptic number.

It is an amenable number.

1238405 is a deficient number, since it is larger than the sum of its proper divisors (503419).

1238405 is an equidigital number, since it uses as much as digits as its factorization.

1238405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1238405 is about 1112.8364659733. The cubic root of 1238405 is about 107.3876236884.

The spelling of 1238405 in words is "one million, two hundred thirty-eight thousand, four hundred five".