400780242 has 12 divisors (see below), whose sum is σ = 868357230. Its totient is φ = 133593408.

The previous prime is 400780157. The next prime is 400780279. The reversal of 400780242 is 242087004.

It can be written as a sum of positive squares in only one way, i.e., 400760361 + 19881 = 20019^2 + 141^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11132767 + ... + 11132802.

Almost surely, 2^400780242 is an apocalyptic number.

400780242 is an abundant number, since it is smaller than the sum of its proper divisors (467576988).

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

400780242 is a wasteful number, since it uses less digits than its factorization.

400780242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22265577 (or 22265574 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 400780242 is about 20019.4965471163. The cubic root of 400780242 is about 737.2850612554.

The spelling of 400780242 in words is "four hundred million, seven hundred eighty thousand, two hundred forty-two".