2123458 has 4 divisors (see below), whose sum is σ = 3185190. Its totient is φ = 1061728.

The previous prime is 2123423. The next prime is 2123461. The reversal of 2123458 is 8543212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 41209 = 1443^2 + 203^2 .

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530863 + ... + 530866.

2^2123458 is an apocalyptic number.

2123458 is a deficient number, since it is larger than the sum of its proper divisors (1061732).

2123458 is a wasteful number, since it uses less digits than its factorization.

2123458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061731.

The product of its digits is 1920, while the sum is 25.

The square root of 2123458 is about 1457.2089760909. The cubic root of 2123458 is about 128.5329746259.

The spelling of 2123458 in words is "two million, one hundred twenty-three thousand, four hundred fifty-eight".