142581738 has 128 divisors (see below), whose sum is σ = 348364800. Its totient is φ = 38472192.

The previous prime is 142581697. The next prime is 142581739. The reversal of 142581738 is 837185241.

It is a super-2 number, since 2×142581738² = 40659104022201288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 142581696 and 142581705.

It is not an unprimeable number, because it can be changed into a prime (142581739) 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 63 ways as a sum of consecutive naturals, for example, 1601998 + ... + 1602086.

It is an arithmetic number, because the mean of its divisors is an integer number (2721600).

Almost surely, 2^142581738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142581738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174182400).

142581738 is an abundant number, since it is smaller than the sum of its proper divisors (205783062).

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

142581738 is a wasteful number, since it uses less digits than its factorization.

142581738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its digits is 53760, while the sum is 39.

The square root of 142581738 is about 11940.7595235814. The cubic root of 142581738 is about 522.4218122819.

The spelling of 142581738 in words is "one hundred forty-two million, five hundred eighty-one thousand, seven hundred thirty-eight".