1378402 has 4 divisors (see below), whose sum is σ = 2067606. Its totient is φ = 689200.

The previous prime is 1378397. The next prime is 1378427. The reversal of 1378402 is 2048731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2048731 = 457 ⋅4483.

It can be written as a sum of positive squares in only one way, i.e., 1147041 + 231361 = 1071^2 + 481^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344599 + ... + 344602.

2^1378402 is an apocalyptic number.

1378402 is a deficient number, since it is larger than the sum of its proper divisors (689204).

1378402 is an equidigital number, since it uses as much as digits as its factorization.

1378402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689203.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1378402 is about 1174.0536614653. The cubic root of 1378402 is about 111.2906378492.

The spelling of 1378402 in words is "one million, three hundred seventy-eight thousand, four hundred two".