402278401 has 8 divisors (see below), whose sum is σ = 475600320. Its totient is φ = 332919888.

The previous prime is 402278381. The next prime is 402278411. The reversal of 402278401 is 104872204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402278401 - 2⁵ = 402278369 is a prime.

It is a super-2 number, since 2×402278401² = 323655823822233602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402278401.

It is not an unprimeable number, because it can be changed into a prime (402278411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 990631 + ... + 991036.

It is an arithmetic number, because the mean of its divisors is an integer number (59450040).

Almost surely, 2^402278401 is an apocalyptic number.

It is an amenable number.

402278401 is a deficient number, since it is larger than the sum of its proper divisors (73321919).

402278401 is a wasteful number, since it uses less digits than its factorization.

402278401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981703.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 402278401 is about 20056.8791440742. The cubic root of 402278401 is about 738.2026021354.

The spelling of 402278401 in words is "four hundred two million, two hundred seventy-eight thousand, four hundred one".