438090857 has 4 divisors (see below), whose sum is σ = 438224640. Its totient is φ = 437957076.

The previous prime is 438090797. The next prime is 438090869. The reversal of 438090857 is 758090834.

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 438090857 - 2¹⁰ = 438089833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438090557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61853 + ... + 68570.

It is an arithmetic number, because the mean of its divisors is an integer number (109556160).

Almost surely, 2^438090857 is an apocalyptic number.

It is an amenable number.

438090857 is a deficient number, since it is larger than the sum of its proper divisors (133783).

438090857 is a wasteful number, since it uses less digits than its factorization.

438090857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133782.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 438090857 is about 20930.6200815934. The cubic root of 438090857 is about 759.4888396838.

The spelling of 438090857 in words is "four hundred thirty-eight million, ninety thousand, eight hundred fifty-seven".