249487689 has 16 divisors (see below), whose sum is σ = 381991680. Its totient is φ = 143246160.

The previous prime is 249487687. The next prime is 249487709. The reversal of 249487689 is 986784942.

It is not a de Polignac number, because 249487689 - 2¹ = 249487687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (249487687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198327 + ... + 199580.

It is an arithmetic number, because the mean of its divisors is an integer number (23874480).

Almost surely, 2^249487689 is an apocalyptic number.

It is an amenable number.

249487689 is a deficient number, since it is larger than the sum of its proper divisors (132503991).

249487689 is a wasteful number, since it uses less digits than its factorization.

249487689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397940.

The product of its digits is 6967296, while the sum is 57.

The square root of 249487689 is about 15795.1792962283. The cubic root of 249487689 is about 629.5299163974.

The spelling of 249487689 in words is "two hundred forty-nine million, four hundred eighty-seven thousand, six hundred eighty-nine".