402089278 has 4 divisors (see below), whose sum is σ = 603133920. Its totient is φ = 201044638.

The previous prime is 402089257. The next prime is 402089279. The reversal of 402089278 is 872980204.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×402089278² = 323351574965122568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 402089278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402089279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100522318 + ... + 100522321.

It is an arithmetic number, because the mean of its divisors is an integer number (150783480).

Almost surely, 2^402089278 is an apocalyptic number.

402089278 is a deficient number, since it is larger than the sum of its proper divisors (201044642).

402089278 is a wasteful number, since it uses less digits than its factorization.

402089278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201044641.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 402089278 is about 20052.1639231281. The cubic root of 402089278 is about 738.0869003606.

The spelling of 402089278 in words is "four hundred two million, eighty-nine thousand, two hundred seventy-eight".