1238420 has 24 divisors (see below), whose sum is σ = 2738400. Its totient is φ = 469152.

The previous prime is 1238411. The next prime is 1238423. The reversal of 1238420 is 248321.

1238420 = 36² + 37² + ... + 155².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1238392 and 1238401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1250 + ... + 2009.

It is an arithmetic number, because the mean of its divisors is an integer number (114100).

2^1238420 is an apocalyptic number.

1238420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1238420 is an abundant number, since it is smaller than the sum of its proper divisors (1499980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1238420 is a wasteful number, since it uses less digits than its factorization.

1238420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3285 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1238420 is about 1112.8432054876. The cubic root of 1238420 is about 107.3880572590.

Subtracting from 1238420 its reverse (248321), we obtain a palindrome (990099).

The spelling of 1238420 in words is "one million, two hundred thirty-eight thousand, four hundred twenty".