21862428 has 36 divisors (see below), whose sum is σ = 59342472. Its totient is φ = 6246240.

The previous prime is 21862417. The next prime is 21862429. The reversal of 21862428 is 82426812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21862429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18003 + ... + 19178.

It is an arithmetic number, because the mean of its divisors is an integer number (1648402).

Almost surely, 2^21862428 is an apocalyptic number.

21862428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21862428 is an abundant number, since it is smaller than the sum of its proper divisors (37480044).

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

21862428 is a wasteful number, since it uses less digits than its factorization.

21862428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37202 (or 37193 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 21862428 is about 4675.7275369722. The cubic root of 21862428 is about 279.6186475106.

The spelling of 21862428 in words is "twenty-one million, eight hundred sixty-two thousand, four hundred twenty-eight".