142402409 has 2 divisors, whose sum is σ = 142402410. Its totient is φ = 142402408.

The previous prime is 142402399. The next prime is 142402411. The reversal of 142402409 is 904204241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141253225 + 1149184 = 11885^2 + 1072^2 .

It is a cyclic number.

It is not a de Polignac number, because 142402409 - 2⁸ = 142402153 is a prime.

Together with 142402411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142407409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71201204 + 71201205.

It is an arithmetic number, because the mean of its divisors is an integer number (71201205).

Almost surely, 2^142402409 is an apocalyptic number.

It is an amenable number.

142402409 is a deficient number, since it is larger than the sum of its proper divisors (1).

142402409 is an equidigital number, since it uses as much as digits as its factorization.

142402409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 142402409 is about 11933.2480490435. The cubic root of 142402409 is about 522.2026989348.

The spelling of 142402409 in words is "one hundred forty-two million, four hundred two thousand, four hundred nine".