249139906 has 4 divisors (see below), whose sum is σ = 373709862. Its totient is φ = 124569952.

The previous prime is 249139873. The next prime is 249139927. The reversal of 249139906 is 609931942.

249139906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 243640881 + 5499025 = 15609^2 + 2345^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62284975 + ... + 62284978.

Almost surely, 2^249139906 is an apocalyptic number.

249139906 is a deficient number, since it is larger than the sum of its proper divisors (124569956).

249139906 is a wasteful number, since it uses less digits than its factorization.

249139906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124569955.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 249139906 is about 15784.1663067772. The cubic root of 249139906 is about 629.2372611888.

The spelling of 249139906 in words is "two hundred forty-nine million, one hundred thirty-nine thousand, nine hundred six".