142923321 has 6 divisors (see below), whose sum is σ = 206444810. Its totient is φ = 95282208.

The previous prime is 142923317. The next prime is 142923329. The reversal of 142923321 is 123329241.

It is a happy number.

142923321 is a `hidden beast` number, since 1 + 429 + 233 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 142922025 + 1296 = 11955^2 + 36^2 .

It is not a de Polignac number, because 142923321 - 2² = 142923317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142923329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7940176 + ... + 7940193.

Almost surely, 2^142923321 is an apocalyptic number.

It is an amenable number.

142923321 is a deficient number, since it is larger than the sum of its proper divisors (63521489).

142923321 is a wasteful number, since it uses less digits than its factorization.

142923321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15880375 (or 15880372 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 142923321 is about 11955.0542031394. The cubic root of 142923321 is about 522.8386681319.

The spelling of 142923321 in words is "one hundred forty-two million, nine hundred twenty-three thousand, three hundred twenty-one".