1021425 has 12 divisors (see below), whose sum is σ = 1688880. Its totient is φ = 544720.

The previous prime is 1021417. The next prime is 1021429. The reversal of 1021425 is 5241201.

It is not a de Polignac number, because 1021425 - 2³ = 1021417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021429) 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 11 ways as a sum of consecutive naturals, for example, 6735 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (140740).

2^1021425 is an apocalyptic number.

1021425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021425 is a deficient number, since it is larger than the sum of its proper divisors (667455).

1021425 is a wasteful number, since it uses less digits than its factorization.

1021425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13632 (or 13627 counting only the distinct ones).

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

The square root of 1021425 is about 1010.6557277332. The cubic root of 1021425 is about 100.7091261809.

Adding to 1021425 its reverse (5241201), we get a palindrome (6262626).

The spelling of 1021425 in words is "one million, twenty-one thousand, four hundred twenty-five".