142439040 has 128 divisors (see below), whose sum is σ = 504532800. Its totient is φ = 37979136.

The previous prime is 142439027. The next prime is 142439047. The reversal of 142439040 is 40934241.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×142439040² = 40577760232243200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 142438995 and 142439013.

It is not an unprimeable number, because it can be changed into a prime (142439047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13159 + ... + 21401.

Almost surely, 2^142439040 is an apocalyptic number.

142439040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142439040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252266400).

142439040 is an abundant number, since it is smaller than the sum of its proper divisors (362093760).

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

142439040 is an equidigital number, since it uses as much as digits as its factorization.

142439040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271 (or 8253 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 142439040 is about 11934.7827797577. The cubic root of 142439040 is about 522.2474715086.

The spelling of 142439040 in words is "one hundred forty-two million, four hundred thirty-nine thousand, forty".