1953421 has 4 divisors (see below), whose sum is σ = 1990332. Its totient is φ = 1916512.

The previous prime is 1953383. The next prime is 1953437. The reversal of 1953421 is 1243591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243591 = 317 ⋅3923.

It can be written as a sum of positive squares in 2 ways, for example, as 1297321 + 656100 = 1139^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1953421 - 2¹⁹ = 1429133 is a prime.

It is a d-powerful number, because it can be written as 1 + 9 + 5⁹ + 3³ + 4⁴ + 2 + 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 (1953451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18376 + ... + 18481.

It is an arithmetic number, because the mean of its divisors is an integer number (497583).

2^1953421 is an apocalyptic number.

It is an amenable number.

1953421 is a deficient number, since it is larger than the sum of its proper divisors (36911).

1953421 is an equidigital number, since it uses as much as digits as its factorization.

1953421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36910.

The product of its digits is 1080, while the sum is 25.

The square root of 1953421 is about 1397.6483821047. The cubic root of 1953421 is about 125.0063143477.

The spelling of 1953421 in words is "one million, nine hundred fifty-three thousand, four hundred twenty-one".