243774397 has 4 divisors (see below), whose sum is σ = 249720156. Its totient is φ = 237828640.

The previous prime is 243774347. The next prime is 243774451. The reversal of 243774397 is 793477342.

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 5812921 + 237961476 = 2411^2 + 15426^2 .

It is a cyclic number.

It is not a de Polignac number, because 243774397 - 2⁷ = 243774269 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 (243774347) 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, 2972818 + ... + 2972899.

It is an arithmetic number, because the mean of its divisors is an integer number (62430039).

Almost surely, 2^243774397 is an apocalyptic number.

It is an amenable number.

243774397 is a deficient number, since it is larger than the sum of its proper divisors (5945759).

243774397 is an equidigital number, since it uses as much as digits as its factorization.

243774397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5945758.

The product of its digits is 889056, while the sum is 46.

The square root of 243774397 is about 15613.2763057598. The cubic root of 243774397 is about 624.6873290451.

The spelling of 243774397 in words is "two hundred forty-three million, seven hundred seventy-four thousand, three hundred ninety-seven".