142638541940 has 12 divisors (see below), whose sum is σ = 299540938116. Its totient is φ = 57055416768.

The previous prime is 142638541921. The next prime is 142638541943. The reversal of 142638541940 is 49145836241.

It can be written as a sum of positive squares in 2 ways, for example, as 111478525456 + 31160016484 = 333884^2 + 176522^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142638541943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3565963529 + ... + 3565963568.

It is an arithmetic number, because the mean of its divisors is an integer number (24961744843).

Almost surely, 2^142638541940 is an apocalyptic number.

142638541940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142638541940 is an abundant number, since it is smaller than the sum of its proper divisors (156902396176).

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

142638541940 is a wasteful number, since it uses less digits than its factorization.

142638541940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131927106 (or 7131927104 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 142638541940 in words is "one hundred forty-two billion, six hundred thirty-eight million, five hundred forty-one thousand, nine hundred forty".