142209431 has 16 divisors (see below), whose sum is σ = 180676608. Its totient is φ = 108885600.

The previous prime is 142209421. The next prime is 142209449. The reversal of 142209431 is 134902241.

It is a cyclic number.

It is not a de Polignac number, because 142209431 - 2⁶ = 142209367 is a prime.

It is a super-2 number, since 2×142209431² = 40447044530687522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 142209431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142209421) 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, 22385 + ... + 28026.

It is an arithmetic number, because the mean of its divisors is an integer number (11292288).

Almost surely, 2^142209431 is an apocalyptic number.

142209431 is a deficient number, since it is larger than the sum of its proper divisors (38467177).

142209431 is a wasteful number, since it uses less digits than its factorization.

142209431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50462.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 142209431 is about 11925.1595796450. The cubic root of 142209431 is about 521.9667029548.

The spelling of 142209431 in words is "one hundred forty-two million, two hundred nine thousand, four hundred thirty-one".