249021889 has 8 divisors (see below), whose sum is σ = 250216128. Its totient is φ = 247831440.

The previous prime is 249021793. The next prime is 249021893. The reversal of 249021889 is 988120942.

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

It is a cyclic number.

It is not a de Polignac number, because 249021889 - 2²⁷ = 114804161 is a prime.

It is a super-2 number, since 2×249021889² = 124023802402256642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249021089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360034 + ... + 360724.

It is an arithmetic number, because the mean of its divisors is an integer number (31277016).

Almost surely, 2^249021889 is an apocalyptic number.

It is an amenable number.

249021889 is a deficient number, since it is larger than the sum of its proper divisors (1194239).

249021889 is an equidigital number, since it uses as much as digits as its factorization.

249021889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 249021889 is about 15780.4274023234. The cubic root of 249021889 is about 629.1378894157.

The spelling of 249021889 in words is "two hundred forty-nine million, twenty-one thousand, eight hundred eighty-nine".