2123929 has 8 divisors (see below), whose sum is σ = 2272968. Its totient is φ = 1977600.

The previous prime is 2123917. The next prime is 2123939. The reversal of 2123929 is 9293212.

It can be written as a sum of positive squares in 4 ways, for example, as 1440000 + 683929 = 1200^2 + 827^2 .

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 2123929 - 2⁵ = 2123897 is a prime.

It is a super-2 number, since 2×2123929² = 9022148794082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2123897 and 2123906.

It is not an unprimeable number, because it can be changed into a prime (2123909) 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, 1099 + ... + 2335.

It is an arithmetic number, because the mean of its divisors is an integer number (284121).

2^2123929 is an apocalyptic number.

It is an amenable number.

2123929 is a deficient number, since it is larger than the sum of its proper divisors (149039).

2123929 is a wasteful number, since it uses less digits than its factorization.

2123929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355.

The product of its digits is 1944, while the sum is 28.

The square root of 2123929 is about 1457.3705774442. The cubic root of 2123929 is about 128.5424771379.

The spelling of 2123929 in words is "two million, one hundred twenty-three thousand, nine hundred twenty-nine".