890855391 has 4 divisors (see below), whose sum is σ = 1187807192. Its totient is φ = 593903592.

The previous prime is 890855387. The next prime is 890855411. The reversal of 890855391 is 193558098.

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

It is not a de Polignac number, because 890855391 - 2² = 890855387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 890855391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (890855191) 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, 148475896 + ... + 148475901.

It is an arithmetic number, because the mean of its divisors is an integer number (296951798).

Almost surely, 2^890855391 is an apocalyptic number.

890855391 is a deficient number, since it is larger than the sum of its proper divisors (296951801).

890855391 is a wasteful number, since it uses less digits than its factorization.

890855391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296951800.

The product of its (nonzero) digits is 388800, while the sum is 48.

The square root of 890855391 is about 29847.2007230159. The cubic root of 890855391 is about 962.2082380080.

The spelling of 890855391 in words is "eight hundred ninety million, eight hundred fifty-five thousand, three hundred ninety-one".