745731 has 36 divisors (see below), whose sum is σ = 1333800. Its totient is φ = 399168.

The previous prime is 745727. The next prime is 745733. The reversal of 745731 is 137547.

It is not a de Polignac number, because 745731 - 2² = 745727 is a prime.

It is a super-4 number, since 4×745731⁴ (a number of 25 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 745695 and 745704.

It is not an unprimeable number, because it can be changed into a prime (745733) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8335 + ... + 8423.

It is an arithmetic number, because the mean of its divisors is an integer number (37050).

2⁷⁴⁵⁷³¹ is an apocalyptic number.

745731 is a deficient number, since it is larger than the sum of its proper divisors (588069).

745731 is a wasteful number, since it uses less digits than its factorization.

745731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 118 counting only the distinct ones).

The product of its digits is 2940, while the sum is 27.

The square root of 745731 is about 863.5571781880. The cubic root of 745731 is about 90.6833173596.

The spelling of 745731 in words is "seven hundred forty-five thousand, seven hundred thirty-one".