406915278 has 64 divisors (see below), whose sum is σ = 1038292992. Its totient is φ = 103229280.

The previous prime is 406915273. The next prime is 406915279. The reversal of 406915278 is 872519604.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406915273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9625 + ... + 30107.

It is an arithmetic number, because the mean of its divisors is an integer number (16223328).

Almost surely, 2^406915278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 406915278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519146496).

406915278 is an abundant number, since it is smaller than the sum of its proper divisors (631377714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406915278 is a wasteful number, since it uses less digits than its factorization.

406915278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20549.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 406915278 is about 20172.1411357347. The cubic root of 406915278 is about 741.0280804029.

The spelling of 406915278 in words is "four hundred six million, nine hundred fifteen thousand, two hundred seventy-eight".