2156469 has 16 divisors (see below), whose sum is σ = 3400320. Its totient is φ = 1189440.

The previous prime is 2156461. The next prime is 2156491. The reversal of 2156469 is 9646512.

It is not a de Polignac number, because 2156469 - 2³ = 2156461 is a prime.

It is a super-2 number, since 2×2156469² = 9300717095922, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1162 + ... + 2379.

It is an arithmetic number, because the mean of its divisors is an integer number (212520).

2^2156469 is an apocalyptic number.

2156469 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2156469 is a deficient number, since it is larger than the sum of its proper divisors (1243851).

2156469 is a wasteful number, since it uses less digits than its factorization.

2156469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580.

The product of its digits is 12960, while the sum is 33.

The square root of 2156469 is about 1468.4920837376. The cubic root of 2156469 is about 129.1956049395.

The spelling of 2156469 in words is "two million, one hundred fifty-six thousand, four hundred sixty-nine".