1392238378 has 4 divisors (see below), whose sum is σ = 2088357570. Its totient is φ = 696119188.

The previous prime is 1392238373. The next prime is 1392238387. The reversal of 1392238378 is 8738322931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8738322931 = 13 ⋅672178687.

It can be written as a sum of positive squares in only one way, i.e., 1088538049 + 303700329 = 32993^2 + 17427^2 .

It is not an unprimeable number, because it can be changed into a prime (1392238373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348059593 + ... + 348059596.

Almost surely, 2^1392238378 is an apocalyptic number.

1392238378 is a deficient number, since it is larger than the sum of its proper divisors (696119192).

1392238378 is an equidigital number, since it uses as much as digits as its factorization.

1392238378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696119191.

The product of its digits is 435456, while the sum is 46.

The square root of 1392238378 is about 37312.7106761222. The cubic root of 1392238378 is about 1116.6177667852.

The spelling of 1392238378 in words is "one billion, three hundred ninety-two million, two hundred thirty-eight thousand, three hundred seventy-eight".