2356421 has 8 divisors (see below), whose sum is σ = 2522520. Its totient is φ = 2193408.

The previous prime is 2356411. The next prime is 2356423. The reversal of 2356421 is 1246532.

2356421 = T₅₁₈ + T₅₁₉ + ... + T₅₃₄.

It can be written as a sum of positive squares in 4 ways, for example, as 148225 + 2208196 = 385^2 + 1486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2356421 - 2¹⁸ = 2094277 is a prime.

It is a d-powerful number, because it can be written as 2¹² + 3⁹ + 5⁸ + 6⁸ + 4⁴ + 2¹⁸ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2356423) 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, 935 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (315315).

2^2356421 is an apocalyptic number.

It is an amenable number.

2356421 is a deficient number, since it is larger than the sum of its proper divisors (166099).

2356421 is a wasteful number, since it uses less digits than its factorization.

2356421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543.

The product of its digits is 1440, while the sum is 23.

The square root of 2356421 is about 1535.0638423206. The cubic root of 2356421 is about 133.0712678891.

The spelling of 2356421 in words is "two million, three hundred fifty-six thousand, four hundred twenty-one".