918390649 has 4 divisors (see below), whose sum is σ = 1001880720. Its totient is φ = 834900580.

The previous prime is 918390623. The next prime is 918390659. The reversal of 918390649 is 946093819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 918390649 - 2⁵ = 918390617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918390659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41745019 + ... + 41745040.

It is an arithmetic number, because the mean of its divisors is an integer number (250470180).

Almost surely, 2^918390649 is an apocalyptic number.

It is an amenable number.

918390649 is a deficient number, since it is larger than the sum of its proper divisors (83490071).

918390649 is a wasteful number, since it uses less digits than its factorization.

918390649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83490070.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 918390649 is about 30304.9607985227. The cubic root of 918390649 is about 972.0213804309.

The spelling of 918390649 in words is "nine hundred eighteen million, three hundred ninety thousand, six hundred forty-nine".