1381897 has 4 divisors (see below), whose sum is σ = 1507536. Its totient is φ = 1256260.

The previous prime is 1381883. The next prime is 1381901. The reversal of 1381897 is 7981831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1381897 - 2⁷ = 1381769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62803 + ... + 62824.

It is an arithmetic number, because the mean of its divisors is an integer number (376884).

2^1381897 is an apocalyptic number.

It is an amenable number.

1381897 is a deficient number, since it is larger than the sum of its proper divisors (125639).

1381897 is a wasteful number, since it uses less digits than its factorization.

1381897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125638.

The product of its digits is 12096, while the sum is 37.

The square root of 1381897 is about 1175.5411519807. The cubic root of 1381897 is about 111.3846192613.

It can be divided in two parts, 1381 and 897, that added together give a triangular number (2278 = T₆₇).

The spelling of 1381897 in words is "one million, three hundred eighty-one thousand, eight hundred ninety-seven".