142409421 has 112 divisors (see below), whose sum is σ = 277009920. Its totient is φ = 71033760.

The previous prime is 142409419. The next prime is 142409431. The reversal of 142409421 is 124904241.

It is a happy number.

It is not a de Polignac number, because 142409421 - 2¹ = 142409419 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 (142409431) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 2413690 + ... + 2413748.

Almost surely, 2^142409421 is an apocalyptic number.

142409421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142409421 is a deficient number, since it is larger than the sum of its proper divisors (134600499).

142409421 is an equidigital number, since it uses as much as digits as its factorization.

142409421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 142409421 is about 11933.5418464092. The cubic root of 142409421 is about 522.2112700099.

The spelling of 142409421 in words is "one hundred forty-two million, four hundred nine thousand, four hundred twenty-one".