2158425 has 36 divisors (see below), whose sum is σ = 3960684. Its totient is φ = 1123200.

The previous prime is 2158423. The next prime is 2158427. The reversal of 2158425 is 5248512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2158423) and next prime (2158427).

It can be written as a sum of positive squares in 6 ways, for example, as 278784 + 1879641 = 528^2 + 1371^2 .

It is not a de Polignac number, because 2158425 - 2¹ = 2158423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11835 + ... + 12015.

It is an arithmetic number, because the mean of its divisors is an integer number (110019).

2^2158425 is an apocalyptic number.

2158425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2158425 is a deficient number, since it is larger than the sum of its proper divisors (1802259).

2158425 is a wasteful number, since it uses less digits than its factorization.

2158425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 242 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2158425 is about 1469.1579220765. The cubic root of 2158425 is about 129.2346549231.

It can be divided in two parts, 21584 and 25, that added together give a square (21609 = 147²).

The spelling of 2158425 in words is "two million, one hundred fifty-eight thousand, four hundred twenty-five".