391550016 has 168 divisors, whose sum is σ = 1224893664. Its totient is φ = 109424640.

The previous prime is 391550011. The next prime is 391550023. The reversal of 391550016 is 610055193.

It is a super-2 number, since 2×391550016² = 306622830059200512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391550011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356380 + ... + 357476.

Almost surely, 2^391550016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391550016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (612446832).

391550016 is an abundant number, since it is smaller than the sum of its proper divisors (833343648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391550016 is a wasteful number, since it uses less digits than its factorization.

391550016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 391550016 is about 19787.6227981029. The cubic root of 391550016 is about 731.5809958332.

The spelling of 391550016 in words is "three hundred ninety-one million, five hundred fifty thousand, sixteen".