1377444421 has 4 divisors (see below), whose sum is σ = 1421878144. Its totient is φ = 1333010700.

The previous prime is 1377444403. The next prime is 1377444437. The reversal of 1377444421 is 1244447731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1377444421 - 2⁷ = 1377444293 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 (1377444461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22216815 + ... + 22216876.

It is an arithmetic number, because the mean of its divisors is an integer number (355469536).

Almost surely, 2^1377444421 is an apocalyptic number.

It is an amenable number.

1377444421 is a deficient number, since it is larger than the sum of its proper divisors (44433723).

1377444421 is an equidigital number, since it uses as much as digits as its factorization.

1377444421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44433722.

The product of its digits is 75264, while the sum is 37.

The square root of 1377444421 is about 37113.9383655252. The cubic root of 1377444421 is about 1112.6486059282.

The spelling of 1377444421 in words is "one billion, three hundred seventy-seven million, four hundred forty-four thousand, four hundred twenty-one".