749391 has 4 divisors (see below), whose sum is σ = 999192. Its totient is φ = 499592.

The previous prime is 749383. The next prime is 749393. The reversal of 749391 is 193947.

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

It is a cyclic number.

It is not a de Polignac number, because 749391 - 2³ = 749383 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124896 + ... + 124901.

It is an arithmetic number, because the mean of its divisors is an integer number (249798).

2⁷⁴⁹³⁹¹ is an apocalyptic number.

749391 is the 548-th centered pentagonal number.

749391 is a deficient number, since it is larger than the sum of its proper divisors (249801).

749391 is a wasteful number, since it uses less digits than its factorization.

749391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249800.

The product of its digits is 6804, while the sum is 33.

The square root of 749391 is about 865.6737260654. The cubic root of 749391 is about 90.8314312838.

The spelling of 749391 in words is "seven hundred forty-nine thousand, three hundred ninety-one".