1025640023 has 4 divisors (see below), whose sum is σ = 1032172920. Its totient is φ = 1019107128.

The previous prime is 1025640017. The next prime is 1025640041. The reversal of 1025640023 is 3200465201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1025640023 - 2⁶ = 1025639959 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 (1025640223) 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, 3266213 + ... + 3266526.

It is an arithmetic number, because the mean of its divisors is an integer number (258043230).

Almost surely, 2^1025640023 is an apocalyptic number.

1025640023 is a deficient number, since it is larger than the sum of its proper divisors (6532897).

1025640023 is an equidigital number, since it uses as much as digits as its factorization.

1025640023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6532896.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1025640023 is about 32025.6151072856. The cubic root of 1025640023 is about 1008.4746517290.

The spelling of 1025640023 in words is "one billion, twenty-five million, six hundred forty thousand, twenty-three".