390139049 has 4 divisors (see below), whose sum is σ = 390349440. Its totient is φ = 389928660.

The previous prime is 390139037. The next prime is 390139081. The reversal of 390139049 is 940931093.

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, and also an emirpimes, since its reverse is a distinct semiprime: 940931093 = 613 ⋅1534961.

It is a cyclic number.

It is not a de Polignac number, because 390139049 - 2¹⁶ = 390073513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390139019) 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, 102389 + ... + 106130.

It is an arithmetic number, because the mean of its divisors is an integer number (97587360).

Almost surely, 2^390139049 is an apocalyptic number.

It is an amenable number.

390139049 is a deficient number, since it is larger than the sum of its proper divisors (210391).

390139049 is a wasteful number, since it uses less digits than its factorization.

390139049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210390.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 390139049 is about 19751.9378542967. The cubic root of 390139049 is about 730.7011771708.

The spelling of 390139049 in words is "three hundred ninety million, one hundred thirty-nine thousand, forty-nine".