142381940 has 24 divisors (see below), whose sum is σ = 299299560. Its totient is φ = 56896128.

The previous prime is 142381931. The next prime is 142381949. The reversal of 142381940 is 49183241.

It is a happy number.

142381940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (142381931) and next prime (142381949).

It can be written as a sum of positive squares in 4 ways, for example, as 5866084 + 136515856 = 2422^2 + 11684^2 .

It is a junction number, because it is equal to n+sod(n) for n = 142381897 and 142381906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142381949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21326 + ... + 27194.

It is an arithmetic number, because the mean of its divisors is an integer number (12470815).

Almost surely, 2^142381940 is an apocalyptic number.

142381940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142381940 is an abundant number, since it is smaller than the sum of its proper divisors (156917620).

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

142381940 is a wasteful number, since it uses less digits than its factorization.

142381940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091 (or 7089 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 142381940 is about 11932.3903724275. The cubic root of 142381940 is about 522.1776771689.

The spelling of 142381940 in words is "one hundred forty-two million, three hundred eighty-one thousand, nine hundred forty".