394515641 has 8 divisors (see below), whose sum is σ = 438568704. Its totient is φ = 352420560.

The previous prime is 394515637. The next prime is 394515701. The reversal of 394515641 is 146515493.

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 394515641 - 2² = 394515637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394515595 and 394515604.

It is not an unprimeable number, because it can be changed into a prime (394512641) 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, 489071 + ... + 489876.

It is an arithmetic number, because the mean of its divisors is an integer number (54821088).

Almost surely, 2^394515641 is an apocalyptic number.

394515641 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

394515641 is a deficient number, since it is larger than the sum of its proper divisors (44053063).

394515641 is a wasteful number, since it uses less digits than its factorization.

394515641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978991.

The product of its digits is 64800, while the sum is 38.

The square root of 394515641 is about 19862.4178034800. The cubic root of 394515641 is about 733.4233660581.

The spelling of 394515641 in words is "three hundred ninety-four million, five hundred fifteen thousand, six hundred forty-one".