142023781 has 8 divisors (see below), whose sum is σ = 149333184. Its totient is φ = 134808960.

The previous prime is 142023773. The next prime is 142023787. The reversal of 142023781 is 187320241.

142023781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142023781 - 2³ = 142023773 is a prime.

It is a super-2 number, since 2×142023781² = 40341508739071922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142023787) 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, 20556 + ... + 26581.

It is an arithmetic number, because the mean of its divisors is an integer number (18666648).

Almost surely, 2^142023781 is an apocalyptic number.

It is an amenable number.

142023781 is a deficient number, since it is larger than the sum of its proper divisors (7309403).

142023781 is a wasteful number, since it uses less digits than its factorization.

142023781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47291.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 142023781 is about 11917.3730746335. The cubic root of 142023781 is about 521.7394669308.

The spelling of 142023781 in words is "one hundred forty-two million, twenty-three thousand, seven hundred eighty-one".