1396921305 has 32 divisors (see below), whose sum is σ = 2434078080. Its totient is φ = 679979520.

The previous prime is 1396921303. The next prime is 1396921313. The reversal of 1396921305 is 5031296931.

It is not a de Polignac number, because 1396921305 - 2¹ = 1396921303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1396921303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22891 + ... + 57600.

It is an arithmetic number, because the mean of its divisors is an integer number (76064940).

Almost surely, 2^1396921305 is an apocalyptic number.

1396921305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1396921305 is a deficient number, since it is larger than the sum of its proper divisors (1037156775).

1396921305 is a wasteful number, since it uses less digits than its factorization.

1396921305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80601.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 1396921305 is about 37375.4104325290. The cubic root of 1396921305 is about 1117.8683159514.

The spelling of 1396921305 in words is "one billion, three hundred ninety-six million, nine hundred twenty-one thousand, three hundred five".