391948450 has 12 divisors (see below), whose sum is σ = 729024210. Its totient is φ = 156779360.

The previous prime is 391948439. The next prime is 391948477. The reversal of 391948450 is 54849193.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 239351841 + 152596609 = 15471^2 + 12353^2 .

It is a junction number, because it is equal to n+sod(n) for n = 391948397 and 391948406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3919435 + ... + 3919534.

Almost surely, 2^391948450 is an apocalyptic number.

391948450 is a deficient number, since it is larger than the sum of its proper divisors (337075760).

391948450 is a wasteful number, since it uses less digits than its factorization.

391948450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7838981 (or 7838976 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 391948450 is about 19797.6879963293. The cubic root of 391948450 is about 731.8290594402.

The spelling of 391948450 in words is "three hundred ninety-one million, nine hundred forty-eight thousand, four hundred fifty".