1381401394 has 4 divisors (see below), whose sum is σ = 2072102094. Its totient is φ = 690700696.

The previous prime is 1381401389. The next prime is 1381401407. The reversal of 1381401394 is 4931041831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4931041831 = 24077 ⋅204803.

It can be written as a sum of positive squares in only one way, i.e., 1006475625 + 374925769 = 31725^2 + 19363^2 .

It is a super-2 number, since 2×1381401394² = 3816539622690286472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345350347 + ... + 345350350.

Almost surely, 2^1381401394 is an apocalyptic number.

1381401394 is a deficient number, since it is larger than the sum of its proper divisors (690700700).

1381401394 is an equidigital number, since it uses as much as digits as its factorization.

1381401394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690700699.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1381401394 is about 37167.2085849879. The cubic root of 1381401394 is about 1113.7130194306.

The spelling of 1381401394 in words is "one billion, three hundred eighty-one million, four hundred one thousand, three hundred ninety-four".