1238409 has 10 divisors (see below), whose sum is σ = 1850090. Its totient is φ = 825552.

The previous prime is 1238407. The next prime is 1238411. The reversal of 1238409 is 9048321.

It is an interprime number because it is at equal distance from previous prime (1238407) and next prime (1238411).

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 129600 = 1053^2 + 360^2 .

It is not a de Polignac number, because 1238409 - 2¹ = 1238407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon 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 9 ways as a sum of consecutive naturals, for example, 7564 + ... + 7725.

It is an arithmetic number, because the mean of its divisors is an integer number (185009).

2^1238409 is an apocalyptic number.

It is an amenable number.

1238409 is a deficient number, since it is larger than the sum of its proper divisors (611681).

1238409 is an equidigital number, since it uses as much as digits as its factorization.

1238409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15301 (or 15292 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1238409 is about 1112.8382631811. The cubic root of 1238409 is about 107.3877393076.

The spelling of 1238409 in words is "one million, two hundred thirty-eight thousand, four hundred nine".