1156420 has 24 divisors (see below), whose sum is σ = 2467584. Its totient is φ = 455136.

The previous prime is 1156403. The next prime is 1156423. The reversal of 1156420 is 246511.

It is not an unprimeable number, because it can be changed into a prime (1156423) 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, 909 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (102816).

2^1156420 is an apocalyptic number.

1156420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156420 is an abundant number, since it is smaller than the sum of its proper divisors (1311164).

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

1156420 is a wasteful number, since it uses less digits than its factorization.

1156420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1156420 is about 1075.3697038693. The cubic root of 1156420 is about 104.9635550009.

Subtracting from 1156420 its reverse (246511), we obtain a palindrome (909909).

The spelling of 1156420 in words is "one million, one hundred fifty-six thousand, four hundred twenty".