1381958 has 8 divisors (see below), whose sum is σ = 2081160. Its totient is φ = 688240.

The previous prime is 1381921. The next prime is 1381967. The reversal of 1381958 is 8591831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668 + ... + 1791.

It is an arithmetic number, because the mean of its divisors is an integer number (260145).

2^1381958 is an apocalyptic number.

1381958 is a deficient number, since it is larger than the sum of its proper divisors (699202).

1381958 is a wasteful number, since it uses less digits than its factorization.

1381958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742.

The product of its digits is 8640, while the sum is 35.

The square root of 1381958 is about 1175.5670971918. The cubic root of 1381958 is about 111.3862581586.

Multiplying 1381958 by its sum of digits (35), we get a triangular number (48368530 = T₉₈₃₅).

The spelling of 1381958 in words is "one million, three hundred eighty-one thousand, nine hundred fifty-eight".