77923399 has 4 divisors (see below), whose sum is σ = 78439600. Its totient is φ = 77407200.

The previous prime is 77923381. The next prime is 77923403. The reversal of 77923399 is 99332977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99332977 = 131 ⋅758267.

It is a cyclic number.

It is not a de Polignac number, because 77923399 - 2¹¹ = 77921351 is a prime.

It is a super-2 number, since 2×77923399² = 12144112223426402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77923099) 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, 257874 + ... + 258175.

It is an arithmetic number, because the mean of its divisors is an integer number (19609900).

Almost surely, 2^77923399 is an apocalyptic number.

77923399 is a deficient number, since it is larger than the sum of its proper divisors (516201).

77923399 is a wasteful number, since it uses less digits than its factorization.

77923399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516200.

The product of its digits is 642978, while the sum is 49.

The square root of 77923399 is about 8827.4231234262. The cubic root of 77923399 is about 427.1259548681.

The spelling of 77923399 in words is "seventy-seven million, nine hundred twenty-three thousand, three hundred ninety-nine".