22478137 has 4 divisors (see below), whose sum is σ = 24521616. Its totient is φ = 20434660.

The previous prime is 22478123. The next prime is 22478149. The reversal of 22478137 is 73187422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22478137 - 2¹¹ = 22476089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22478167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021723 + ... + 1021744.

It is an arithmetic number, because the mean of its divisors is an integer number (6130404).

Almost surely, 2^22478137 is an apocalyptic number.

It is an amenable number.

22478137 is a deficient number, since it is larger than the sum of its proper divisors (2043479).

22478137 is a wasteful number, since it uses less digits than its factorization.

22478137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043478.

The product of its digits is 18816, while the sum is 34.

The square root of 22478137 is about 4741.1113676015. Note that the first 3 decimals coincide. The cubic root of 22478137 is about 282.2193396061.

The spelling of 22478137 in words is "twenty-two million, four hundred seventy-eight thousand, one hundred thirty-seven".