1378236401 has 4 divisors (see below), whose sum is σ = 1401596400. Its totient is φ = 1354876404.

The previous prime is 1378236373. The next prime is 1378236403. The reversal of 1378236401 is 1046328731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1046328731 = 7 ⋅149475533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378236401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378236403) 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, 11679911 + ... + 11680028.

It is an arithmetic number, because the mean of its divisors is an integer number (350399100).

Almost surely, 2^1378236401 is an apocalyptic number.

It is an amenable number.

1378236401 is a deficient number, since it is larger than the sum of its proper divisors (23359999).

1378236401 is an equidigital number, since it uses as much as digits as its factorization.

1378236401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23359998.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1378236401 is about 37124.6064086880. The cubic root of 1378236401 is about 1112.8618091128.

The spelling of 1378236401 in words is "one billion, three hundred seventy-eight million, two hundred thirty-six thousand, four hundred one".