891429421 has 8 divisors (see below), whose sum is σ = 915675264. Its totient is φ = 867302880.

The previous prime is 891429389. The next prime is 891429491. The reversal of 891429421 is 124924198.

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 891429421 - 2⁵ = 891429389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891429491) 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, 14575 + ... + 44668.

It is an arithmetic number, because the mean of its divisors is an integer number (114459408).

Almost surely, 2^891429421 is an apocalyptic number.

It is an amenable number.

891429421 is a deficient number, since it is larger than the sum of its proper divisors (24245843).

891429421 is a wasteful number, since it uses less digits than its factorization.

891429421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59651.

The product of its digits is 41472, while the sum is 40.

The square root of 891429421 is about 29856.8153191194. The cubic root of 891429421 is about 962.4148625656.

The spelling of 891429421 in words is "eight hundred ninety-one million, four hundred twenty-nine thousand, four hundred twenty-one".