402191947 has 4 divisors (see below), whose sum is σ = 404297856. Its totient is φ = 400086040.

The previous prime is 402191941. The next prime is 402191963. The reversal of 402191947 is 749191204.

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 402191947 - 2³ = 402191939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402191941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052668 + ... + 1053049.

It is an arithmetic number, because the mean of its divisors is an integer number (101074464).

Almost surely, 2^402191947 is an apocalyptic number.

402191947 is a deficient number, since it is larger than the sum of its proper divisors (2105909).

402191947 is a wasteful number, since it uses less digits than its factorization.

402191947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105908.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 402191947 is about 20054.7238076220. The cubic root of 402191947 is about 738.1497157594.

The spelling of 402191947 in words is "four hundred two million, one hundred ninety-one thousand, nine hundred forty-seven".