1240421 has 16 divisors (see below), whose sum is σ = 1567104. Its totient is φ = 955584.

The previous prime is 1240399. The next prime is 1240423.

1240421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1240421 - 2¹⁰ = 1239397 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1240396 and 1240405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3755 + ... + 4071.

It is an arithmetic number, because the mean of its divisors is an integer number (97944).

2^1240421 is an apocalyptic number.

It is an amenable number.

1240421 is a deficient number, since it is larger than the sum of its proper divisors (326683).

1240421 is a wasteful number, since it uses less digits than its factorization.

1240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1240421 is about 1113.7418911040. The cubic root of 1240421 is about 107.4458642153.

It can be divided in two parts, 1240 and 421, that added together give a palindrome (1661).

The spelling of 1240421 in words is "one million, two hundred forty thousand, four hundred twenty-one".