660349406 has 8 divisors (see below), whose sum is σ = 991277904. Its totient is φ = 329923440.

The previous prime is 660349373. The next prime is 660349429. The reversal of 660349406 is 604943066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×660349406² = 872122676009105672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660349406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122330 + ... + 127613.

It is an arithmetic number, because the mean of its divisors is an integer number (123909738).

Almost surely, 2^660349406 is an apocalyptic number.

660349406 is a deficient number, since it is larger than the sum of its proper divisors (330928498).

660349406 is a wasteful number, since it uses less digits than its factorization.

660349406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251266.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 660349406 is about 25697.2645625950. The cubic root of 660349406 is about 870.8123851425.

The spelling of 660349406 in words is "six hundred sixty million, three hundred forty-nine thousand, four hundred six".