646401941 has 8 divisors (see below), whose sum is σ = 668601024. Its totient is φ = 624509280.

The previous prime is 646401911. The next prime is 646401947. The reversal of 646401941 is 149104646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646401941 - 2²² = 642207637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646401947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72311 + ... + 80756.

It is an arithmetic number, because the mean of its divisors is an integer number (83575128).

Almost surely, 2^646401941 is an apocalyptic number.

It is an amenable number.

646401941 is a deficient number, since it is larger than the sum of its proper divisors (22199083).

646401941 is a wasteful number, since it uses less digits than its factorization.

646401941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153211.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 646401941 is about 25424.4359032801. The cubic root of 646401941 is about 864.6377986167.

The spelling of 646401941 in words is "six hundred forty-six million, four hundred one thousand, nine hundred forty-one".