390168538 has 4 divisors (see below), whose sum is σ = 585252810. Its totient is φ = 195084268.

The previous prime is 390168529. The next prime is 390168577. The reversal of 390168538 is 835861093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835861093 = 199 ⋅4200307.

It can be written as a sum of positive squares in only one way, i.e., 389549169 + 619369 = 19737^2 + 787^2 .

It is a junction number, because it is equal to n+sod(n) for n = 390168494 and 390168503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97542133 + ... + 97542136.

Almost surely, 2^390168538 is an apocalyptic number.

390168538 is a deficient number, since it is larger than the sum of its proper divisors (195084272).

390168538 is a wasteful number, since it uses less digits than its factorization.

390168538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195084271.

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

The square root of 390168538 is about 19752.6843239090. The cubic root of 390168538 is about 730.7195869354.

The spelling of 390168538 in words is "three hundred ninety million, one hundred sixty-eight thousand, five hundred thirty-eight".