1397138811 has 8 divisors (see below), whose sum is σ = 1877520384. Its totient is φ = 924091560.

The previous prime is 1397138807. The next prime is 1397138849. The reversal of 1397138811 is 1188317931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397138811 - 2² = 1397138807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1397138851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1833135 + ... + 1833896.

It is an arithmetic number, because the mean of its divisors is an integer number (234690048).

Almost surely, 2^1397138811 is an apocalyptic number.

1397138811 is a deficient number, since it is larger than the sum of its proper divisors (480381573).

1397138811 is a wasteful number, since it uses less digits than its factorization.

1397138811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667161.

The product of its digits is 36288, while the sum is 42.

The square root of 1397138811 is about 37378.3200665841. The cubic root of 1397138811 is about 1117.9263317338.

The spelling of 1397138811 in words is "one billion, three hundred ninety-seven million, one hundred thirty-eight thousand, eight hundred eleven".