1420521 has 4 divisors (see below), whose sum is σ = 1894032. Its totient is φ = 947012.

The previous prime is 1420519. The next prime is 1420561. The reversal of 1420521 is 1250241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1420521 - 2¹ = 1420519 is a prime.

It is a super-2 number, since 2×1420521² = 4035759822882, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1420521.

It is not an unprimeable number, because it can be changed into a prime (1420501) 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, 236751 + ... + 236756.

It is an arithmetic number, because the mean of its divisors is an integer number (473508).

2^1420521 is an apocalyptic number.

It is an amenable number.

1420521 is a deficient number, since it is larger than the sum of its proper divisors (473511).

1420521 is an equidigital number, since it uses as much as digits as its factorization.

1420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473510.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1420521 is about 1191.8561154770. The cubic root of 1420521 is about 112.4128312416.

Adding to 1420521 its reverse (1250241), we get a palindrome (2670762).

The spelling of 1420521 in words is "one million, four hundred twenty thousand, five hundred twenty-one".