1378460221 has 8 divisors (see below), whose sum is σ = 1426066488. Its totient is φ = 1331520000.

The previous prime is 1378460191. The next prime is 1378460231. The reversal of 1378460221 is 1220648731.

It can be written as a sum of positive squares in 4 ways, for example, as 221712100 + 1156748121 = 14890^2 + 34011^2 .

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 1378460221 - 2¹³ = 1378452029 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 (1378460231) 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, 162300 + ... + 170581.

It is an arithmetic number, because the mean of its divisors is an integer number (178258311).

Almost surely, 2^1378460221 is an apocalyptic number.

It is an amenable number.

1378460221 is a deficient number, since it is larger than the sum of its proper divisors (47606267).

1378460221 is a wasteful number, since it uses less digits than its factorization.

1378460221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333023.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1378460221 is about 37127.6207290475. The cubic root of 1378460221 is about 1112.9220472664.

The spelling of 1378460221 in words is "one billion, three hundred seventy-eight million, four hundred sixty thousand, two hundred twenty-one".