402424391 has 4 divisors (see below), whose sum is σ = 426096432. Its totient is φ = 378752352.

The previous prime is 402424369. The next prime is 402424397. The reversal of 402424391 is 193424204.

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

It is a cyclic number.

It is not a de Polignac number, because 402424391 - 2⁶ = 402424327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402424397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11835995 + ... + 11836028.

It is an arithmetic number, because the mean of its divisors is an integer number (106524108).

Almost surely, 2^402424391 is an apocalyptic number.

402424391 is a deficient number, since it is larger than the sum of its proper divisors (23672041).

402424391 is a wasteful number, since it uses less digits than its factorization.

402424391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23672040.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 402424391 is about 20060.5182136454. The cubic root of 402424391 is about 738.2918911811.

Adding to 402424391 its reverse (193424204), we get a palindrome (595848595).

The spelling of 402424391 in words is "four hundred two million, four hundred twenty-four thousand, three hundred ninety-one".