142489721 has 12 divisors (see below), whose sum is σ = 164866800. Its totient is φ = 122716440.

The previous prime is 142489703. The next prime is 142489729. The reversal of 142489721 is 127984241.

It is a happy number.

It is not a de Polignac number, because 142489721 - 2⁶ = 142489657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142489729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28691 + ... + 33288.

It is an arithmetic number, because the mean of its divisors is an integer number (13738900).

Almost surely, 2^142489721 is an apocalyptic number.

142489721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142489721 is a deficient number, since it is larger than the sum of its proper divisors (22377079).

142489721 is a wasteful number, since it uses less digits than its factorization.

142489721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62020 (or 62009 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 142489721 is about 11936.9058386166. The cubic root of 142489721 is about 522.3094041677.

The spelling of 142489721 in words is "one hundred forty-two million, four hundred eighty-nine thousand, seven hundred twenty-one".