22157858 has 4 divisors (see below), whose sum is σ = 33236790. Its totient is φ = 11078928.

The previous prime is 22157797. The next prime is 22157867. The reversal of 22157858 is 85875122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85875122 = 2 ⋅42937561.

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 10413529 = 3427^2 + 3227^2 .

It is a super-2 number, since 2×22157858² = 981941342296328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5539463 + ... + 5539466.

Almost surely, 2^22157858 is an apocalyptic number.

22157858 is a deficient number, since it is larger than the sum of its proper divisors (11078932).

22157858 is a wasteful number, since it uses less digits than its factorization.

22157858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11078931.

The product of its digits is 44800, while the sum is 38.

The square root of 22157858 is about 4707.2134007287. The cubic root of 22157858 is about 280.8725248473.

The spelling of 22157858 in words is "twenty-two million, one hundred fifty-seven thousand, eight hundred fifty-eight".