145721422 has 32 divisors (see below), whose sum is σ = 284373504. Its totient is φ = 54304800.

The previous prime is 145721417. The next prime is 145721423. The reversal of 145721422 is 224127541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145721423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17029 + ... + 24112.

It is an arithmetic number, because the mean of its divisors is an integer number (8886672).

Almost surely, 2^145721422 is an apocalyptic number.

145721422 is a deficient number, since it is larger than the sum of its proper divisors (138652082).

145721422 is a wasteful number, since it uses less digits than its factorization.

145721422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41184.

The product of its digits is 4480, while the sum is 28.

The square root of 145721422 is about 12071.5128297989. The cubic root of 145721422 is about 526.2286230204.

Adding to 145721422 its reverse (224127541), we get a palindrome (369848963).

The spelling of 145721422 in words is "one hundred forty-five million, seven hundred twenty-one thousand, four hundred twenty-two".