22781406 has 16 divisors (see below), whose sum is σ = 45704448. Its totient is φ = 7570200.

The previous prime is 22781401. The next prime is 22781441. The reversal of 22781406 is 60418722.

22781406 = T₁₉₃ + T₁₉₄ + ... + T₅₂₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22781401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3750 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (2856528).

Almost surely, 2^22781406 is an apocalyptic number.

22781406 is an abundant number, since it is smaller than the sum of its proper divisors (22923042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22781406 is a wasteful number, since it uses less digits than its factorization.

22781406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11807.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 22781406 is about 4772.9871150046. The cubic root of 22781406 is about 283.4828832954.

The spelling of 22781406 in words is "twenty-two million, seven hundred eighty-one thousand, four hundred six".