249687387 has 12 divisors (see below), whose sum is σ = 370028920. Its totient is φ = 166403520.

The previous prime is 249687377. The next prime is 249687391. The reversal of 249687387 is 783786942.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

249687387 is a `hidden beast` number, since 2 + 496 + 8 + 73 + 87 = 666.

It is not a de Polignac number, because 249687387 - 2⁴ = 249687371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249687307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80587 + ... + 83627.

Almost surely, 2^249687387 is an apocalyptic number.

249687387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

249687387 is a deficient number, since it is larger than the sum of its proper divisors (120341533).

249687387 is an frugal number, since it uses more digits than its factorization.

249687387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091 (or 3044 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 249687387 is about 15801.4995174509. The cubic root of 249687387 is about 629.6978369580.

The spelling of 249687387 in words is "two hundred forty-nine million, six hundred eighty-seven thousand, three hundred eighty-seven".