1390843538 has 24 divisors (see below), whose sum is σ = 2510570700. Its totient is φ = 575520288.

The previous prime is 1390843537. The next prime is 1390843547. The reversal of 1390843538 is 8353480931.

It can be written as a sum of positive squares in 2 ways, for example, as 1335683209 + 55160329 = 36547^2 + 7427^2 .

It is not an unprimeable number, because it can be changed into a prime (1390843537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241853 + ... + 247536.

Almost surely, 2^1390843538 is an apocalyptic number.

1390843538 is a deficient number, since it is larger than the sum of its proper divisors (1119727162).

1390843538 is a wasteful number, since it uses less digits than its factorization.

1390843538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489434 (or 489427 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 1390843538 is about 37294.0147744916. The cubic root of 1390843538 is about 1116.2447407340.

The spelling of 1390843538 in words is "one billion, three hundred ninety million, eight hundred forty-three thousand, five hundred thirty-eight".