745921 has 16 divisors (see below), whose sum is σ = 887040. Its totient is φ = 619920.

The previous prime is 745903. The next prime is 745931. The reversal of 745921 is 129547.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 745921 - 2¹³ = 737729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 745921.

It is not an unprimeable number, because it can be changed into a prime (745931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8946 + ... + 9028.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2⁷⁴⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

745921 is a deficient number, since it is larger than the sum of its proper divisors (141119).

745921 is a wasteful number, since it uses less digits than its factorization.

745921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156.

The product of its digits is 2520, while the sum is 28.

The square root of 745921 is about 863.6671812683. The cubic root of 745921 is about 90.6910182451.

It can be divided in two parts, 74 and 5921, that added together give a palindrome (5995).

The spelling of 745921 in words is "seven hundred forty-five thousand, nine hundred twenty-one".