740638 has 8 divisors (see below), whose sum is σ = 1114632. Its totient is φ = 369096.

The previous prime is 740603. The next prime is 740651. The reversal of 740638 is 836047.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

740638 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 3 ways as a sum of consecutive naturals, for example, 756 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (139329).

2⁷⁴⁰⁶³⁸ is an apocalyptic number.

740638 is a deficient number, since it is larger than the sum of its proper divisors (373994).

740638 is a wasteful number, since it uses less digits than its factorization.

740638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 740638 is about 860.6032767774. The cubic root of 740638 is about 90.4764038073.

It can be divided in two parts, 740 and 638, that added together give a triangular number (1378 = T₅₂).

The spelling of 740638 in words is "seven hundred forty thousand, six hundred thirty-eight".