402347666 has 16 divisors (see below), whose sum is σ = 690779904. Its totient is φ = 172174464.

The previous prime is 402347641. The next prime is 402347677. The reversal of 402347666 is 666743204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11930 + ... + 30773.

It is an arithmetic number, because the mean of its divisors is an integer number (43173744).

Almost surely, 2^402347666 is an apocalyptic number.

402347666 is a deficient number, since it is larger than the sum of its proper divisors (288432238).

402347666 is a wasteful number, since it uses less digits than its factorization.

402347666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43385.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 402347666 is about 20058.6057840519. The cubic root of 402347666 is about 738.2449680431.

The spelling of 402347666 in words is "four hundred two million, three hundred forty-seven thousand, six hundred sixty-six".