409749978 has 32 divisors (see below), whose sum is σ = 901927872. Its totient is φ = 123065600.

The previous prime is 409749919. The next prime is 409749979. The reversal of 409749978 is 879947904.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (409749979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20013 + ... + 34928.

It is an arithmetic number, because the mean of its divisors is an integer number (28185246).

Almost surely, 2^409749978 is an apocalyptic number.

409749978 is an abundant number, since it is smaller than the sum of its proper divisors (492177894).

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

409749978 is a wasteful number, since it uses less digits than its factorization.

409749978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55070.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 409749978 is about 20242.2819365802. The cubic root of 409749978 is about 742.7448450528.

The spelling of 409749978 in words is "four hundred nine million, seven hundred forty-nine thousand, nine hundred seventy-eight".