142974397 has 4 divisors (see below), whose sum is σ = 143163036. Its totient is φ = 142785760.

The previous prime is 142974367. The next prime is 142974407. The reversal of 142974397 is 793479241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60000516 + 82973881 = 7746^2 + 9109^2 .

It is a cyclic number.

It is not a de Polignac number, because 142974397 - 2¹⁵ = 142941629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142974347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93178 + ... + 94699.

It is an arithmetic number, because the mean of its divisors is an integer number (35790759).

Almost surely, 2^142974397 is an apocalyptic number.

It is an amenable number.

142974397 is a deficient number, since it is larger than the sum of its proper divisors (188639).

142974397 is an equidigital number, since it uses as much as digits as its factorization.

142974397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188638.

The product of its digits is 381024, while the sum is 46.

The square root of 142974397 is about 11957.1901799712. The cubic root of 142974397 is about 522.9009423806.

The spelling of 142974397 in words is "one hundred forty-two million, nine hundred seventy-four thousand, three hundred ninety-seven".