1231420 has 24 divisors (see below), whose sum is σ = 2699424. Its totient is φ = 470976.

The previous prime is 1231411. The next prime is 1231421. The reversal of 1231420 is 241321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231421) 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, 879 + ... + 1798.

It is an arithmetic number, because the mean of its divisors is an integer number (112476).

2^1231420 is an apocalyptic number.

1231420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231420 is an abundant number, since it is smaller than the sum of its proper divisors (1468004).

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

1231420 is a wasteful number, since it uses less digits than its factorization.

1231420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1231420 is about 1109.6936514192. The cubic root of 1231420 is about 107.1853427276.

Adding to 1231420 its reverse (241321), we get a palindrome (1472741).

Subtracting from 1231420 its reverse (241321), we obtain a palindrome (990099).

The spelling of 1231420 in words is "one million, two hundred thirty-one thousand, four hundred twenty".