1381770406 has 4 divisors (see below), whose sum is σ = 2072655612. Its totient is φ = 690885202.

The previous prime is 1381770391. The next prime is 1381770427. The reversal of 1381770406 is 6040771831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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, 345442600 + ... + 345442603.

It is an arithmetic number, because the mean of its divisors is an integer number (518163903).

Almost surely, 2^1381770406 is an apocalyptic number.

1381770406 is a deficient number, since it is larger than the sum of its proper divisors (690885206).

1381770406 is an equidigital number, since it uses as much as digits as its factorization.

1381770406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690885205.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1381770406 is about 37172.1724681246. The cubic root of 1381770406 is about 1113.8121788498.

The spelling of 1381770406 in words is "one billion, three hundred eighty-one million, seven hundred seventy thousand, four hundred six".