402678231 has 4 divisors (see below), whose sum is σ = 536904312. Its totient is φ = 268452152.

The previous prime is 402678223. The next prime is 402678239. The reversal of 402678231 is 132876204.

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

It is an interprime number because it is at equal distance from previous prime (402678223) and next prime (402678239).

It is a cyclic number.

It is not a de Polignac number, because 402678231 - 2³ = 402678223 is a prime.

It is a super-2 number, since 2×402678231² = 324299515442578722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402678192 and 402678201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402678239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67113036 + ... + 67113041.

It is an arithmetic number, because the mean of its divisors is an integer number (134226078).

Almost surely, 2^402678231 is an apocalyptic number.

402678231 is a deficient number, since it is larger than the sum of its proper divisors (134226081).

402678231 is a wasteful number, since it uses less digits than its factorization.

402678231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134226080.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 402678231 is about 20066.8440717518. The cubic root of 402678231 is about 738.4470910376.

The spelling of 402678231 in words is "four hundred two million, six hundred seventy-eight thousand, two hundred thirty-one".