420123145 has 16 divisors (see below), whose sum is σ = 561652560. Its totient is φ = 299545344.

The previous prime is 420123133. The next prime is 420123161. The reversal of 420123145 is 541321024.

It can be written as a sum of positive squares in 8 ways, for example, as 242064 + 419881081 = 492^2 + 20491^2 .

It is a cyclic number.

It is not a de Polignac number, because 420123145 - 2⁵ = 420123113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109554 + ... + 113323.

It is an arithmetic number, because the mean of its divisors is an integer number (35103285).

Almost surely, 2^420123145 is an apocalyptic number.

It is an amenable number.

420123145 is a deficient number, since it is larger than the sum of its proper divisors (141529415).

420123145 is a wasteful number, since it uses less digits than its factorization.

420123145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222924.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 420123145 is about 20496.9057420870. The cubic root of 420123145 is about 748.9604234102.

Adding to 420123145 its reverse (541321024), we get a palindrome (961444169).

The spelling of 420123145 in words is "four hundred twenty million, one hundred twenty-three thousand, one hundred forty-five".