249649387 has 4 divisors (see below), whose sum is σ = 268853200. Its totient is φ = 230445576.

The previous prime is 249649381. The next prime is 249649427. The reversal of 249649387 is 783946942.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 249649387 - 2¹⁹ = 249125099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249649381) 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, 9601887 + ... + 9601912.

It is an arithmetic number, because the mean of its divisors is an integer number (67213300).

Almost surely, 2^249649387 is an apocalyptic number.

249649387 is a deficient number, since it is larger than the sum of its proper divisors (19203813).

249649387 is a wasteful number, since it uses less digits than its factorization.

249649387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19203812.

The product of its digits is 2612736, while the sum is 52.

The square root of 249649387 is about 15800.2970541696. The cubic root of 249649387 is about 629.6658907016.

It can be divided in two parts, 249 and 649387, that added together give a square (649636 = 806²).

The spelling of 249649387 in words is "two hundred forty-nine million, six hundred forty-nine thousand, three hundred eighty-seven".