390390621 has 8 divisors (see below), whose sum is σ = 520949280. Its totient is φ = 260046192.

The previous prime is 390390619. The next prime is 390390647. The reversal of 390390621 is 126093093.

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

It is not a de Polignac number, because 390390621 - 2¹ = 390390619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390390691) 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, 49255 + ... + 56628.

It is an arithmetic number, because the mean of its divisors is an integer number (65118660).

Almost surely, 2^390390621 is an apocalyptic number.

It is an amenable number.

390390621 is a deficient number, since it is larger than the sum of its proper divisors (130558659).

390390621 is a wasteful number, since it uses less digits than its factorization.

390390621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107115.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 390390621 is about 19758.3051145588. The cubic root of 390390621 is about 730.8582019202.

The spelling of 390390621 in words is "three hundred ninety million, three hundred ninety thousand, six hundred twenty-one".