142749 has 16 divisors (see below), whose sum is σ = 224640. Its totient is φ = 89280.

The previous prime is 142733. The next prime is 142757. The reversal of 142749 is 947241.

142749 = T₁₂₁ + T₁₂₂ + ... + T₁₃₇.

It is a happy number.

It is not a de Polignac number, because 142749 - 2⁴ = 142733 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142759) 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, 304 + ... + 614.

It is an arithmetic number, because the mean of its divisors is an integer number (14040).

2¹⁴²⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

142749 is a deficient number, since it is larger than the sum of its proper divisors (81891).

142749 is a wasteful number, since it uses less digits than its factorization.

142749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 331 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 142749 is about 377.8213863719. The cubic root of 142749 is about 52.2626016017.

The spelling of 142749 in words is "one hundred forty-two thousand, seven hundred forty-nine".