142749390 has 64 divisors (see below), whose sum is σ = 394606080. Its totient is φ = 32373120.

The previous prime is 142749359. The next prime is 142749419. The reversal of 142749390 is 93947241.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24916 + ... + 30104.

It is an arithmetic number, because the mean of its divisors is an integer number (6165720).

Almost surely, 2^142749390 is an apocalyptic number.

142749390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 142749390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197303040).

142749390 is an abundant number, since it is smaller than the sum of its proper divisors (251856690).

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

142749390 is a wasteful number, since it uses less digits than its factorization.

142749390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 142749390 is about 11947.7776176158. Note that the first 3 decimals coincide. The cubic root of 142749390 is about 522.6264919669.

The spelling of 142749390 in words is "one hundred forty-two million, seven hundred forty-nine thousand, three hundred ninety".