1025400189 has 32 divisors (see below), whose sum is σ = 1572825600. Its totient is φ = 587684160.

The previous prime is 1025400157. The next prime is 1025400193. The reversal of 1025400189 is 9810045201.

It is a happy number.

It is not a de Polignac number, because 1025400189 - 2⁵ = 1025400157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025400109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462247 + ... + 464459.

It is an arithmetic number, because the mean of its divisors is an integer number (49150800).

Almost surely, 2^1025400189 is an apocalyptic number.

1025400189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1025400189 is a deficient number, since it is larger than the sum of its proper divisors (547425411).

1025400189 is a wasteful number, since it uses less digits than its factorization.

1025400189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1025400189 is about 32021.8704794083. The cubic root of 1025400189 is about 1008.3960389087.

The spelling of 1025400189 in words is "one billion, twenty-five million, four hundred thousand, one hundred eighty-nine".