390044987 has 4 divisors (see below), whose sum is σ = 390088560. Its totient is φ = 390001416.

The previous prime is 390044969. The next prime is 390045011. The reversal of 390044987 is 789440093.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 789440093 = 13 ⋅60726161.

It is a cyclic number.

It is not a de Polignac number, because 390044987 - 2¹⁶ = 389979451 is a prime.

It is a super-3 number, since 3×390044987³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390044917) 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, 2903 + ... + 28080.

It is an arithmetic number, because the mean of its divisors is an integer number (97522140).

Almost surely, 2^390044987 is an apocalyptic number.

390044987 is a deficient number, since it is larger than the sum of its proper divisors (43573).

390044987 is a wasteful number, since it uses less digits than its factorization.

390044987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43572.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 390044987 is about 19749.5566279347. The cubic root of 390044987 is about 730.6424487605.

The spelling of 390044987 in words is "three hundred ninety million, forty-four thousand, nine hundred eighty-seven".