39390518 has 4 divisors (see below), whose sum is σ = 59085780. Its totient is φ = 19695258.

The previous prime is 39390517. The next prime is 39390523. The reversal of 39390518 is 81509393.

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

It is a super-2 number, since 2×39390518² = 3103225816616648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39390517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9847628 + ... + 9847631.

It is an arithmetic number, because the mean of its divisors is an integer number (14771445).

Almost surely, 2^39390518 is an apocalyptic number.

39390518 is a deficient number, since it is larger than the sum of its proper divisors (19695262).

39390518 is a wasteful number, since it uses less digits than its factorization.

39390518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19695261.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 39390518 is about 6276.1865810379. The cubic root of 39390518 is about 340.2492923728.

The spelling of 39390518 in words is "thirty-nine million, three hundred ninety thousand, five hundred eighteen".