1420657 has 12 divisors (see below), whose sum is σ = 1678080. Its totient is φ = 1199016.

The previous prime is 1420651. The next prime is 1420667. The reversal of 1420657 is 7560241.

It is not a de Polignac number, because 1420657 - 2¹⁹ = 896369 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 (1420651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3688 + ... + 4054.

It is an arithmetic number, because the mean of its divisors is an integer number (139840).

2^1420657 is an apocalyptic number.

It is an amenable number.

1420657 is a deficient number, since it is larger than the sum of its proper divisors (257423).

1420657 is an equidigital number, since it uses as much as digits as its factorization.

1420657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1420657 is about 1191.9131679783. The cubic root of 1420657 is about 112.4164185773.

Adding to 1420657 its reverse (7560241), we get a palindrome (8980898).

The spelling of 1420657 in words is "one million, four hundred twenty thousand, six hundred fifty-seven".