1426400138 has 4 divisors (see below), whose sum is σ = 2139600210. Its totient is φ = 713200068.

The previous prime is 1426400083. The next prime is 1426400141. The reversal of 1426400138 is 8310046241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8310046241 = 7 ⋅1187149463.

It can be written as a sum of positive squares in only one way, i.e., 971132569 + 455267569 = 31163^2 + 21337^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1426400138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356600033 + ... + 356600036.

Almost surely, 2^1426400138 is an apocalyptic number.

1426400138 is a deficient number, since it is larger than the sum of its proper divisors (713200072).

1426400138 is an equidigital number, since it uses as much as digits as its factorization.

1426400138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713200071.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1426400138 is about 37767.7129040137. The cubic root of 1426400138 is about 1125.6769951214.

Adding to 1426400138 its reverse (8310046241), we get a palindrome (9736446379).

The spelling of 1426400138 in words is "one billion, four hundred twenty-six million, four hundred thousand, one hundred thirty-eight".