1521943 has 4 divisors (see below), whose sum is σ = 1529368. Its totient is φ = 1514520.

The previous prime is 1521937. The next prime is 1521973. The reversal of 1521943 is 3491251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3491251 = 31 ⋅112621.

It is a cyclic number.

It is not a de Polignac number, because 1521943 - 2¹³ = 1513751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3396 + ... + 3817.

It is an arithmetic number, because the mean of its divisors is an integer number (382342).

2^1521943 is an apocalyptic number.

1521943 is a deficient number, since it is larger than the sum of its proper divisors (7425).

1521943 is an equidigital number, since it uses as much as digits as its factorization.

1521943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7424.

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

The square root of 1521943 is about 1233.6705394878. The cubic root of 1521943 is about 115.0269124160.

The spelling of 1521943 in words is "one million, five hundred twenty-one thousand, nine hundred forty-three".