249690638 has 8 divisors (see below), whose sum is σ = 387451080. Its totient is φ = 120540280.

The previous prime is 249690619. The next prime is 249690641. The reversal of 249690638 is 836096942.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 249690592 and 249690601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152448 + ... + 2152563.

It is an arithmetic number, because the mean of its divisors is an integer number (48431385).

Almost surely, 2^249690638 is an apocalyptic number.

249690638 is a deficient number, since it is larger than the sum of its proper divisors (137760442).

249690638 is a wasteful number, since it uses less digits than its factorization.

249690638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305042.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 249690638 is about 15801.6023870999. The cubic root of 249690638 is about 629.7005698938.

The spelling of 249690638 in words is "two hundred forty-nine million, six hundred ninety thousand, six hundred thirty-eight".