11837421 has 10 divisors (see below), whose sum is σ = 17683182. Its totient is φ = 7891560.

The previous prime is 11837407. The next prime is 11837429. The reversal of 11837421 is 12473811.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 202500 = 3411^2 + 450^2 .

It is not a de Polignac number, because 11837421 - 2¹⁰ = 11836397 is a prime.

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

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11837429) 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, 72990 + ... + 73151.

Almost surely, 2^11837421 is an apocalyptic number.

It is an amenable number.

11837421 is a deficient number, since it is larger than the sum of its proper divisors (5845761).

11837421 is an equidigital number, since it uses as much as digits as its factorization.

11837421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146153 (or 146144 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 11837421 is about 3440.5553330821. Note that the first 3 decimals coincide. The cubic root of 11837421 is about 227.9042187714.

The spelling of 11837421 in words is "eleven million, eight hundred thirty-seven thousand, four hundred twenty-one".