394861972 has 6 divisors (see below), whose sum is σ = 691008458. Its totient is φ = 197430984.

The previous prime is 394861963. The next prime is 394861979. The reversal of 394861972 is 279168493.

It can be written as a sum of positive squares in only one way, i.e., 355096336 + 39765636 = 18844^2 + 6306^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394861979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49357743 + ... + 49357750.

Almost surely, 2^394861972 is an apocalyptic number.

It is an amenable number.

394861972 is a deficient number, since it is larger than the sum of its proper divisors (296146486).

394861972 is a wasteful number, since it uses less digits than its factorization.

394861972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98715497 (or 98715495 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 394861972 is about 19871.1341397516. The cubic root of 394861972 is about 733.6379185622.

The spelling of 394861972 in words is "three hundred ninety-four million, eight hundred sixty-one thousand, nine hundred seventy-two".