390421849 has 4 divisors (see below), whose sum is σ = 407396736. Its totient is φ = 373446964.

The previous prime is 390421831. The next prime is 390421859. The reversal of 390421849 is 948124093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 390421849 - 2¹⁹ = 389897561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390421819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8487409 + ... + 8487454.

It is an arithmetic number, because the mean of its divisors is an integer number (101849184).

Almost surely, 2^390421849 is an apocalyptic number.

It is an amenable number.

390421849 is a deficient number, since it is larger than the sum of its proper divisors (16974887).

390421849 is a wasteful number, since it uses less digits than its factorization.

390421849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974886.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 390421849 is about 19759.0953487248. The cubic root of 390421849 is about 730.8776889247.

The spelling of 390421849 in words is "three hundred ninety million, four hundred twenty-one thousand, eight hundred forty-nine".