390749861 has 8 divisors (see below), whose sum is σ = 397703040. Its totient is φ = 383807808.

The previous prime is 390749851. The next prime is 390749881. The reversal of 390749861 is 168947093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 390749861 - 2¹⁴ = 390733477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390749831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102980 + ... + 106706.

It is an arithmetic number, because the mean of its divisors is an integer number (49712880).

Almost surely, 2^390749861 is an apocalyptic number.

It is an amenable number.

390749861 is a deficient number, since it is larger than the sum of its proper divisors (6953179).

390749861 is a wasteful number, since it uses less digits than its factorization.

390749861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 390749861 is about 19767.3938848802. The cubic root of 390749861 is about 731.0823133555.

The spelling of 390749861 in words is "three hundred ninety million, seven hundred forty-nine thousand, eight hundred sixty-one".