2156725 has 6 divisors (see below), whose sum is σ = 2674370. Its totient is φ = 1725360.

The previous prime is 2156719. The next prime is 2156731. The reversal of 2156725 is 5276512.

It is an interprime number because it is at equal distance from previous prime (2156719) and next prime (2156731).

It can be written as a sum of positive squares in 3 ways, for example, as 7569 + 2149156 = 87^2 + 1466^2 .

It is not a de Polignac number, because 2156725 - 2⁷ = 2156597 is a prime.

2156725 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2156693 and 2156702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43110 + ... + 43159.

2^2156725 is an apocalyptic number.

2156725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2156725 is a deficient number, since it is larger than the sum of its proper divisors (517645).

2156725 is an equidigital number, since it uses as much as digits as its factorization.

2156725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86279 (or 86274 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 2156725 is about 1468.5792453933. The cubic root of 2156725 is about 129.2007171185.

The spelling of 2156725 in words is "two million, one hundred fifty-six thousand, seven hundred twenty-five".