1390534238 has 4 divisors (see below), whose sum is σ = 2085801360. Its totient is φ = 695267118.

The previous prime is 1390534231. The next prime is 1390534273. The reversal of 1390534238 is 8324350931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8324350931 = 13 ⋅640334687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390534231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347633558 + ... + 347633561.

It is an arithmetic number, because the mean of its divisors is an integer number (521450340).

Almost surely, 2^1390534238 is an apocalyptic number.

1390534238 is a deficient number, since it is larger than the sum of its proper divisors (695267122).

1390534238 is an equidigital number, since it uses as much as digits as its factorization.

1390534238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695267121.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1390534238 is about 37289.8677659227. The cubic root of 1390534238 is about 1116.1619899704.

The spelling of 1390534238 in words is "one billion, three hundred ninety million, five hundred thirty-four thousand, two hundred thirty-eight".