320240537 has 4 divisors (see below), whose sum is σ = 320276736. Its totient is φ = 320204340.

The previous prime is 320240527. The next prime is 320240567. The reversal of 320240537 is 735042023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 735042023 = 31 ⋅23711033.

It is a cyclic number.

It is not a de Polignac number, because 320240537 - 2¹⁴ = 320224153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320240507) 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, 4988 + ... + 25794.

It is an arithmetic number, because the mean of its divisors is an integer number (80069184).

Almost surely, 2^320240537 is an apocalyptic number.

It is an amenable number.

320240537 is a deficient number, since it is larger than the sum of its proper divisors (36199).

320240537 is a wasteful number, since it uses less digits than its factorization.

320240537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36198.

The product of its (nonzero) digits is 5040, while the sum is 26.

The square root of 320240537 is about 17895.2657705886. The cubic root of 320240537 is about 684.1617159495.

The spelling of 320240537 in words is "three hundred twenty million, two hundred forty thousand, five hundred thirty-seven".