1378652057 has 4 divisors (see below), whose sum is σ = 1423124736. Its totient is φ = 1334179380.

The previous prime is 1378652047. The next prime is 1378652071. The reversal of 1378652057 is 7502568731.

It is a happy number.

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 1378652057 - 2¹⁰ = 1378651033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1378651999 and 1378652017.

It is not an unprimeable number, because it can be changed into a prime (1378652047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22236293 + ... + 22236354.

It is an arithmetic number, because the mean of its divisors is an integer number (355781184).

Almost surely, 2^1378652057 is an apocalyptic number.

It is an amenable number.

1378652057 is a deficient number, since it is larger than the sum of its proper divisors (44472679).

1378652057 is an equidigital number, since it uses as much as digits as its factorization.

1378652057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44472678.

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 1378652057 is about 37130.2041066300. The cubic root of 1378652057 is about 1112.9736721658.

The spelling of 1378652057 in words is "one billion, three hundred seventy-eight million, six hundred fifty-two thousand, fifty-seven".