402861993 has 4 divisors (see below), whose sum is σ = 537149328. Its totient is φ = 268574660.

The previous prime is 402861989. The next prime is 402862003. The reversal of 402861993 is 399168204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402861993 - 2² = 402861989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402861923) 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 3 ways as a sum of consecutive naturals, for example, 67143663 + ... + 67143668.

It is an arithmetic number, because the mean of its divisors is an integer number (134287332).

Almost surely, 2^402861993 is an apocalyptic number.

It is an amenable number.

402861993 is a deficient number, since it is larger than the sum of its proper divisors (134287335).

402861993 is a wasteful number, since it uses less digits than its factorization.

402861993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134287334.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 402861993 is about 20071.4222963895. The cubic root of 402861993 is about 738.5594039359.

The spelling of 402861993 in words is "four hundred two million, eight hundred sixty-one thousand, nine hundred ninety-three".