2155967 has 4 divisors (see below), whose sum is σ = 2351976. Its totient is φ = 1959960.

The previous prime is 2155963. The next prime is 2155999. The reversal of 2155967 is 7695512.

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 2155967 - 2² = 2155963 is a prime.

It is a super-3 number, since 3×2155967³ = 30064056713338848189, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155961) 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 3 ways as a sum of consecutive naturals, for example, 97988 + ... + 98009.

It is an arithmetic number, because the mean of its divisors is an integer number (587994).

2^2155967 is an apocalyptic number.

2155967 is a deficient number, since it is larger than the sum of its proper divisors (196009).

2155967 is a wasteful number, since it uses less digits than its factorization.

2155967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196008.

The product of its digits is 18900, while the sum is 35.

The square root of 2155967 is about 1468.3211501576. The cubic root of 2155967 is about 129.1855791015.

The spelling of 2155967 in words is "two million, one hundred fifty-five thousand, nine hundred sixty-seven".