1420257 has 4 divisors (see below), whose sum is σ = 1893680. Its totient is φ = 946836.

The previous prime is 1420253. The next prime is 1420259. The reversal of 1420257 is 7520241.

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 not a de Polignac number, because 1420257 - 2² = 1420253 is a prime.

It is a D-number.

It is a Duffinian number.

1420257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1420253) 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, 236707 + ... + 236712.

It is an arithmetic number, because the mean of its divisors is an integer number (473420).

2^1420257 is an apocalyptic number.

It is an amenable number.

1420257 is a deficient number, since it is larger than the sum of its proper divisors (473423).

1420257 is an equidigital number, since it uses as much as digits as its factorization.

1420257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473422.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 1420257 is about 1191.7453587071. The cubic root of 1420257 is about 112.4058669362.

Adding to 1420257 its reverse (7520241), we get a palindrome (8940498).

The spelling of 1420257 in words is "one million, four hundred twenty thousand, two hundred fifty-seven".