1405738 has 4 divisors (see below), whose sum is σ = 2108610. Its totient is φ = 702868.

The previous prime is 1405721. The next prime is 1405751. The reversal of 1405738 is 8375041.

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

It can be written as a sum of positive squares in only one way, i.e., 744769 + 660969 = 863^2 + 813^2 .

It is a super-3 number, since 3×1405738³ = 8333633737279221816, which contains 333 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 351433 + ... + 351436.

2^1405738 is an apocalyptic number.

1405738 is a deficient number, since it is larger than the sum of its proper divisors (702872).

1405738 is an equidigital number, since it uses as much as digits as its factorization.

1405738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702871.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1405738 is about 1185.6382247549. The cubic root of 1405738 is about 112.0215200995.

The spelling of 1405738 in words is "one million, four hundred five thousand, seven hundred thirty-eight".