821902934 has 4 divisors (see below), whose sum is σ = 1232854404. Its totient is φ = 410951466.

The previous prime is 821902877. The next prime is 821902937. The reversal of 821902934 is 439209128.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821902937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205475732 + ... + 205475735.

It is an arithmetic number, because the mean of its divisors is an integer number (308213601).

Almost surely, 2^821902934 is an apocalyptic number.

821902934 is a deficient number, since it is larger than the sum of its proper divisors (410951470).

821902934 is a wasteful number, since it uses less digits than its factorization.

821902934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410951469.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 821902934 is about 28668.8495409216. The cubic root of 821902934 is about 936.7136385276.

The spelling of 821902934 in words is "eight hundred twenty-one million, nine hundred two thousand, nine hundred thirty-four".