745438 has 4 divisors (see below), whose sum is σ = 1118160. Its totient is φ = 372718.

The previous prime is 745397. The next prime is 745471. The reversal of 745438 is 834547.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186358 + ... + 186361.

It is an arithmetic number, because the mean of its divisors is an integer number (279540).

2⁷⁴⁵⁴³⁸ is an apocalyptic number.

745438 is the 462-nd centered heptagonal number.

745438 is a deficient number, since it is larger than the sum of its proper divisors (372722).

745438 is a wasteful number, since it uses less digits than its factorization.

745438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372721.

The product of its digits is 13440, while the sum is 31.

The square root of 745438 is about 863.3875143874. The cubic root of 745438 is about 90.6714392192.

The spelling of 745438 in words is "seven hundred forty-five thousand, four hundred thirty-eight".