391620098 has 4 divisors (see below), whose sum is σ = 587430150. Its totient is φ = 195810048.

The previous prime is 391620091. The next prime is 391620101. The reversal of 391620098 is 890026193.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 391367089 + 253009 = 19783^2 + 503^2 .

It is not an unprimeable number, because it can be changed into a prime (391620091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97905023 + ... + 97905026.

Almost surely, 2^391620098 is an apocalyptic number.

391620098 is a deficient number, since it is larger than the sum of its proper divisors (195810052).

391620098 is a wasteful number, since it uses less digits than its factorization.

391620098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195810051.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 391620098 is about 19789.3935733261. The cubic root of 391620098 is about 731.6246408327.

The spelling of 391620098 in words is "three hundred ninety-one million, six hundred twenty thousand, ninety-eight".