1394200921 has 3 divisors (see below), whose sum is σ = 1394238261. Its totient is φ = 1394163582.

The previous prime is 1394200891. The next prime is 1394200949. The reversal of 1394200921 is 1290024931.

The square root of 1394200921 is 37339.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-1394200921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394200961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18670 + ... + 56008.

It is an arithmetic number, because the mean of its divisors is an integer number (464746087).

Almost surely, 2^1394200921 is an apocalyptic number.

1394200921 is the 37339-th square number.

1394200921 is the 18670-th centered octagonal number.

It is an amenable number.

1394200921 is a deficient number, since it is larger than the sum of its proper divisors (37340).

1394200921 is an frugal number, since it uses more digits than its factorization.

1394200921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74678 (or 37339 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The cubic root of 1394200921 is about 1117.1421936191.

The spelling of 1394200921 in words is "one billion, three hundred ninety-four million, two hundred thousand, nine hundred twenty-one".