142320402 has 60 divisors (see below), whose sum is σ = 370989630. Its totient is φ = 40660704.

The previous prime is 142320397. The next prime is 142320407. The reversal of 142320402 is 204023241.

It is an interprime number because it is at equal distance from previous prime (142320397) and next prime (142320407).

It can be written as a sum of positive squares in only one way, i.e., 118788201 + 23532201 = 10899^2 + 4851^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (142320407) 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 29 ways as a sum of consecutive naturals, for example, 1027 + ... + 16902.

Almost surely, 2^142320402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142320402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185494815).

142320402 is an abundant number, since it is smaller than the sum of its proper divisors (228669228).

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

142320402 is a wasteful number, since it uses less digits than its factorization.

142320402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17957 (or 17941 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 142320402 is about 11929.8114821652. The cubic root of 142320402 is about 522.1024372884.

Adding to 142320402 its reverse (204023241), we get a palindrome (346343643).

The spelling of 142320402 in words is "one hundred forty-two million, three hundred twenty thousand, four hundred two".