1381731 has 16 divisors (see below), whose sum is σ = 2016000. Its totient is φ = 836640.

The previous prime is 1381727. The next prime is 1381739. The reversal of 1381731 is 1371831.

It is not a de Polignac number, because 1381731 - 2² = 1381727 is a prime.

It is a super-2 number, since 2×1381731² = 3818361112722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1381739) 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, 2520 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (126000).

2^1381731 is an apocalyptic number.

1381731 is a deficient number, since it is larger than the sum of its proper divisors (634269).

1381731 is a wasteful number, since it uses less digits than its factorization.

1381731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586.

The product of its digits is 504, while the sum is 24.

The square root of 1381731 is about 1175.4705440801. The cubic root of 1381731 is about 111.3801590670.

It can be divided in two parts, 1381 and 731, that added together give a palindrome (2112).

The spelling of 1381731 in words is "one million, three hundred eighty-one thousand, seven hundred thirty-one".