22378487 has 2 divisors, whose sum is σ = 22378488. Its totient is φ = 22378486.

The previous prime is 22378481. The next prime is 22378507. The reversal of 22378487 is 78487322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22378487 - 2⁶ = 22378423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22378481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11189243 + 11189244.

It is an arithmetic number, because the mean of its divisors is an integer number (11189244).

Almost surely, 2^22378487 is an apocalyptic number.

22378487 is a deficient number, since it is larger than the sum of its proper divisors (1).

22378487 is an equidigital number, since it uses as much as digits as its factorization.

22378487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The square root of 22378487 is about 4730.5905550999. The cubic root of 22378487 is about 281.8016772001.

The spelling of 22378487 in words is "twenty-two million, three hundred seventy-eight thousand, four hundred eighty-seven".