402191920406 has 4 divisors (see below), whose sum is σ = 603287880612. Its totient is φ = 201095960202.

The previous prime is 402191920381. The next prime is 402191920433. The reversal of 402191920406 is 604029191204.

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

It is a self number, because there is not a number n which added to its sum of digits gives 402191920406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100547980100 + ... + 100547980103.

It is an arithmetic number, because the mean of its divisors is an integer number (150821970153).

Almost surely, 2^402191920406 is an apocalyptic number.

402191920406 is a deficient number, since it is larger than the sum of its proper divisors (201095960206).

402191920406 is a wasteful number, since it uses less digits than its factorization.

402191920406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201095960205.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 402191920406 in words is "four hundred two billion, one hundred ninety-one million, nine hundred twenty thousand, four hundred six".