1025643 has 8 divisors (see below), whose sum is σ = 1414800. Its totient is φ = 660128.

The previous prime is 1025641. The next prime is 1025653. The reversal of 1025643 is 3465201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1025643 - 2¹ = 1025641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1025641) 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 7 ways as a sum of consecutive naturals, for example, 5808 + ... + 5981.

It is an arithmetic number, because the mean of its divisors is an integer number (176850).

2^1025643 is an apocalyptic number.

1025643 is a deficient number, since it is larger than the sum of its proper divisors (389157).

1025643 is a wasteful number, since it uses less digits than its factorization.

1025643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11821.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1025643 is about 1012.7403418448. The cubic root of 1025643 is about 100.8475627453.

The spelling of 1025643 in words is "one million, twenty-five thousand, six hundred forty-three".