780406 has 16 divisors (see below), whose sum is σ = 1344960. Its totient is φ = 335880.

The previous prime is 780401. The next prime is 780421. The reversal of 780406 is 604087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780401) by changing a digit.

780406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 1351.

It is an arithmetic number, because the mean of its divisors is an integer number (84060).

2⁷⁸⁰⁴⁰⁶ is an apocalyptic number.

780406 is a deficient number, since it is larger than the sum of its proper divisors (564554).

780406 is a wasteful number, since it uses less digits than its factorization.

780406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 780406 is about 883.4059089682. The cubic root of 780406 is about 92.0676094079.

The spelling of 780406 in words is "seven hundred eighty thousand, four hundred six".