320400279 has 20 divisors (see below), whose sum is σ = 491562984. Its totient is φ = 207825264.

The previous prime is 320400277. The next prime is 320400307. The reversal of 320400279 is 972004023.

It is not a de Polignac number, because 320400279 - 2¹ = 320400277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320400271) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 50457 + ... + 56450.

Almost surely, 2^320400279 is an apocalyptic number.

320400279 is a deficient number, since it is larger than the sum of its proper divisors (171162705).

320400279 is a wasteful number, since it uses less digits than its factorization.

320400279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106956 (or 106947 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 320400279 is about 17899.7284616276. The cubic root of 320400279 is about 684.2754546150.

The spelling of 320400279 in words is "three hundred twenty million, four hundred thousand, two hundred seventy-nine".