1390923229 has 4 divisors (see below), whose sum is σ = 1451398176. Its totient is φ = 1330448284.

The previous prime is 1390923223. The next prime is 1390923241. The reversal of 1390923229 is 9223290931.

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: 9223290931 = 131 ⋅70406801.

It is a cyclic number.

It is not a de Polignac number, because 1390923229 - 2⁹ = 1390922717 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1390923191 and 1390923200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390923223) 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, 30237439 + ... + 30237484.

It is an arithmetic number, because the mean of its divisors is an integer number (362849544).

Almost surely, 2^1390923229 is an apocalyptic number.

It is an amenable number.

1390923229 is a deficient number, since it is larger than the sum of its proper divisors (60474947).

1390923229 is an equidigital number, since it uses as much as digits as its factorization.

1390923229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60474946.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 1390923229 is about 37295.0831745955. The cubic root of 1390923229 is about 1116.2660594417.

The spelling of 1390923229 in words is "one billion, three hundred ninety million, nine hundred twenty-three thousand, two hundred twenty-nine".