390050781 has 16 divisors (see below), whose sum is σ = 540571584. Its totient is φ = 249951744.

The previous prime is 390050779. The next prime is 390050827. The reversal of 390050781 is 187050093.

It is not a de Polignac number, because 390050781 - 2¹ = 390050779 is a prime.

It is a super-2 number, since 2×390050781² = 304279223517419922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390050281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11956 + ... + 30381.

It is an arithmetic number, because the mean of its divisors is an integer number (33785724).

Almost surely, 2^390050781 is an apocalyptic number.

It is an amenable number.

390050781 is a deficient number, since it is larger than the sum of its proper divisors (150520803).

390050781 is a wasteful number, since it uses less digits than its factorization.

390050781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42460.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 390050781 is about 19749.7033142273. The cubic root of 390050781 is about 730.6460665665.

The spelling of 390050781 in words is "three hundred ninety million, fifty thousand, seven hundred eighty-one".