402211906 has 4 divisors (see below), whose sum is σ = 603317862. Its totient is φ = 201105952.

The previous prime is 402211883. The next prime is 402211907. The reversal of 402211906 is 609112204.

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

It can be written as a sum of positive squares in only one way, i.e., 385768881 + 16443025 = 19641^2 + 4055^2 .

It is not an unprimeable number, because it can be changed into a prime (402211907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100552975 + ... + 100552978.

Almost surely, 2^402211906 is an apocalyptic number.

402211906 is a deficient number, since it is larger than the sum of its proper divisors (201105956).

402211906 is a wasteful number, since it uses less digits than its factorization.

402211906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201105955.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 402211906 is about 20055.2214148835. The cubic root of 402211906 is about 738.1619259214.

The spelling of 402211906 in words is "four hundred two million, two hundred eleven thousand, nine hundred six".