142203440 has 20 divisors (see below), whose sum is σ = 330623184. Its totient is φ = 56881344.

The previous prime is 142203433. The next prime is 142203449. The reversal of 142203440 is 44302241.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (142203449) 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 3 ways as a sum of consecutive naturals, for example, 888692 + ... + 888851.

Almost surely, 2^142203440 is an apocalyptic number.

142203440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142203440 is an abundant number, since it is smaller than the sum of its proper divisors (188419744).

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

142203440 is a wasteful number, since it uses less digits than its factorization.

142203440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777556 (or 1777550 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 142203440 is about 11924.9083853923. The cubic root of 142203440 is about 521.9593730461.

Adding to 142203440 its reverse (44302241), we get a palindrome (186505681).

The spelling of 142203440 in words is "one hundred forty-two million, two hundred three thousand, four hundred forty".