921397386 has 64 divisors (see below), whose sum is σ = 2299223808. Its totient is φ = 239666688.

The previous prime is 921397339. The next prime is 921397391. The reversal of 921397386 is 683793129.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28300 + ... + 51416.

It is an arithmetic number, because the mean of its divisors is an integer number (35925372).

Almost surely, 2^921397386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921397386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149611904).

921397386 is an abundant number, since it is smaller than the sum of its proper divisors (1377826422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921397386 is a wasteful number, since it uses less digits than its factorization.

921397386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23215.

The product of its digits is 489888, while the sum is 48.

The square root of 921397386 is about 30354.5282618591. The cubic root of 921397386 is about 973.0809981346.

The spelling of 921397386 in words is "nine hundred twenty-one million, three hundred ninety-seven thousand, three hundred eighty-six".