1381206398 has 32 divisors (see below), whose sum is σ = 2441087712. Its totient is φ = 577843200.

The previous prime is 1381206391. The next prime is 1381206451. The reversal of 1381206398 is 8936021831.

It is a super-2 number, since 2×1381206398² = 3815462227752268808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381206391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94118 + ... + 107798.

It is an arithmetic number, because the mean of its divisors is an integer number (76283991).

Almost surely, 2^1381206398 is an apocalyptic number.

1381206398 is a deficient number, since it is larger than the sum of its proper divisors (1059881314).

1381206398 is a wasteful number, since it uses less digits than its factorization.

1381206398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14060.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1381206398 is about 37164.5852660836. The cubic root of 1381206398 is about 1113.6606137590.

The spelling of 1381206398 in words is "one billion, three hundred eighty-one million, two hundred six thousand, three hundred ninety-eight".