1378672401 has 4 divisors (see below), whose sum is σ = 1838229872. Its totient is φ = 919114932.

The previous prime is 1378672397. The next prime is 1378672447. The reversal of 1378672401 is 1042768731.

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 not a de Polignac number, because 1378672401 - 2² = 1378672397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1378672401.

It is not an unprimeable number, because it can be changed into a prime (1378670401) 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, 229778731 + ... + 229778736.

It is an arithmetic number, because the mean of its divisors is an integer number (459557468).

Almost surely, 2^1378672401 is an apocalyptic number.

It is an amenable number.

1378672401 is a deficient number, since it is larger than the sum of its proper divisors (459557471).

1378672401 is an equidigital number, since it uses as much as digits as its factorization.

1378672401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459557470.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 1378672401 is about 37130.4780604829. The cubic root of 1378672401 is about 1112.9791466496.

The spelling of 1378672401 in words is "one billion, three hundred seventy-eight million, six hundred seventy-two thousand, four hundred one".