2157969 has 8 divisors (see below), whose sum is σ = 3138912. Its totient is φ = 1307840.

The previous prime is 2157923. The next prime is 2157989. The reversal of 2157969 is 9697512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157969 - 2⁹ = 2157457 is a prime.

It is a super-2 number, since 2×2157969² = 9313660409922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32664 + ... + 32729.

It is an arithmetic number, because the mean of its divisors is an integer number (392364).

2^2157969 is an apocalyptic number.

It is an amenable number.

2157969 is a deficient number, since it is larger than the sum of its proper divisors (980943).

2157969 is a wasteful number, since it uses less digits than its factorization.

2157969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65407.

The product of its digits is 34020, while the sum is 39.

The square root of 2157969 is about 1469.0027229383. The cubic root of 2157969 is about 129.2255533555.

The spelling of 2157969 in words is "two million, one hundred fifty-seven thousand, nine hundred sixty-nine".