77401405 has 4 divisors (see below), whose sum is σ = 92881692. Its totient is φ = 61921120.

The previous prime is 77401367. The next prime is 77401427. The reversal of 77401405 is 50410477.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9865881 + 67535524 = 3141^2 + 8218^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77401405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7740136 + ... + 7740145.

It is an arithmetic number, because the mean of its divisors is an integer number (23220423).

Almost surely, 2^77401405 is an apocalyptic number.

It is an amenable number.

77401405 is a deficient number, since it is larger than the sum of its proper divisors (15480287).

77401405 is a wasteful number, since it uses less digits than its factorization.

77401405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15480286.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 77401405 is about 8797.8068289773. The cubic root of 77401405 is about 426.1700721299.

It can be divided in two parts, 7740140 and 5, that added together give a triangular number (7740145 = T₃₉₃₄).

The spelling of 77401405 in words is "seventy-seven million, four hundred one thousand, four hundred five".