142440381 has 36 divisors (see below), whose sum is σ = 218110464. Its totient is φ = 89525520.

The previous prime is 142440349. The next prime is 142440421. The reversal of 142440381 is 183044241.

142440381 is a `hidden beast` number, since 142 + 440 + 3 + 81 = 666.

It is not a de Polignac number, because 142440381 - 2⁵ = 142440349 is a prime.

It is a super-2 number, since 2×142440381² = 40578524278850322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142440481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 371716 + ... + 372098.

It is an arithmetic number, because the mean of its divisors is an integer number (6058624).

Almost surely, 2^142440381 is an apocalyptic number.

It is an amenable number.

142440381 is a deficient number, since it is larger than the sum of its proper divisors (75670083).

142440381 is a wasteful number, since it uses less digits than its factorization.

142440381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 142440381 is about 11934.8389599525. The cubic root of 142440381 is about 522.2491104124.

The spelling of 142440381 in words is "one hundred forty-two million, four hundred forty thousand, three hundred eighty-one".