249921445 has 8 divisors (see below), whose sum is σ = 307220760. Its totient is φ = 195060480.

The previous prime is 249921443. The next prime is 249921479. The reversal of 249921445 is 544129942.

It can be written as a sum of positive squares in 4 ways, for example, as 10074276 + 239847169 = 3174^2 + 15487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 249921445 - 2¹ = 249921443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249921398 and 249921407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249921443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609360 + ... + 609769.

It is an arithmetic number, because the mean of its divisors is an integer number (38402595).

Almost surely, 2^249921445 is an apocalyptic number.

It is an amenable number.

249921445 is a deficient number, since it is larger than the sum of its proper divisors (57299315).

249921445 is a wasteful number, since it uses less digits than its factorization.

249921445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219175.

The product of its digits is 103680, while the sum is 40.

The square root of 249921445 is about 15808.9039784547. The cubic root of 249921445 is about 629.8945359699.

The spelling of 249921445 in words is "two hundred forty-nine million, nine hundred twenty-one thousand, four hundred forty-five".