1406381 has 8 divisors (see below), whose sum is σ = 1499904. Its totient is φ = 1315600.

The previous prime is 1406357. The next prime is 1406387. The reversal of 1406381 is 1836041.

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

It is a de Polignac number, because none of the positive numbers 2^k-1406381 is a prime.

It is a super-2 number, since 2×1406381² = 3955815034322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406387) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 431 + ... + 1731.

It is an arithmetic number, because the mean of its divisors is an integer number (187488).

2^1406381 is an apocalyptic number.

It is an amenable number.

1406381 is a deficient number, since it is larger than the sum of its proper divisors (93523).

1406381 is a wasteful number, since it uses less digits than its factorization.

1406381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1406381 is about 1185.9093557267. The cubic root of 1406381 is about 112.0385974538.

The spelling of 1406381 in words is "one million, four hundred six thousand, three hundred eighty-one".