738991 has 4 divisors (see below), whose sum is σ = 806184. Its totient is φ = 671800.

The previous prime is 738989. The next prime is 739003. The reversal of 738991 is 199837.

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 738991 - 2¹ = 738989 is a prime.

It is a super-2 number, since 2×738991² = 1092215396162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 738991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (738961) 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, 33580 + ... + 33601.

It is an arithmetic number, because the mean of its divisors is an integer number (201546).

2⁷³⁸⁹⁹¹ is an apocalyptic number.

738991 is the 460-th centered heptagonal number.

738991 is a deficient number, since it is larger than the sum of its proper divisors (67193).

738991 is a wasteful number, since it uses less digits than its factorization.

738991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67192.

The product of its digits is 13608, while the sum is 37.

The square root of 738991 is about 859.6458573157. The cubic root of 738991 is about 90.4092881443.

The spelling of 738991 in words is "seven hundred thirty-eight thousand, nine hundred ninety-one".