1278374401 has 4 divisors (see below), whose sum is σ = 1278747652. Its totient is φ = 1278001152.

The previous prime is 1278374393. The next prime is 1278374411. The reversal of 1278374401 is 1044738721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 320410000 + 957964401 = 17900^2 + 30951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278374401 - 2³ = 1278374393 is a prime.

It is a super-2 number, since 2×1278374401² = 3268482218264217602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278374411) 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, 181440 + ... + 188353.

It is an arithmetic number, because the mean of its divisors is an integer number (319686913).

Almost surely, 2^1278374401 is an apocalyptic number.

It is an amenable number.

1278374401 is a deficient number, since it is larger than the sum of its proper divisors (373251).

1278374401 is an equidigital number, since it uses as much as digits as its factorization.

1278374401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373250.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 1278374401 is about 35754.3619856375. The cubic root of 1278374401 is about 1085.3072108190.

The spelling of 1278374401 in words is "one billion, two hundred seventy-eight million, three hundred seventy-four thousand, four hundred one".