398642012 has 12 divisors (see below), whose sum is σ = 698168856. Its totient is φ = 199165200.

The previous prime is 398642011. The next prime is 398642017. The reversal of 398642012 is 210246893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398642011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33098 + ... + 43505.

It is an arithmetic number, because the mean of its divisors is an integer number (58180738).

Almost surely, 2^398642012 is an apocalyptic number.

It is an amenable number.

398642012 is a deficient number, since it is larger than the sum of its proper divisors (299526844).

398642012 is a wasteful number, since it uses less digits than its factorization.

398642012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77908 (or 77906 counting only the distinct ones).

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

The square root of 398642012 is about 19966.0214364304. The cubic root of 398642012 is about 735.9715425946.

The spelling of 398642012 in words is "three hundred ninety-eight million, six hundred forty-two thousand, twelve".