1390785851 has 16 divisors (see below), whose sum is σ = 1751549184. Its totient is φ = 1074808224.

The previous prime is 1390785797. The next prime is 1390785871. The reversal of 1390785851 is 1585870931.

It is a happy number.

It is not a de Polignac number, because 1390785851 - 2²⁶ = 1323676987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390785796 and 1390785805.

It is not an unprimeable number, because it can be changed into a prime (1390785871) 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, 173801 + ... + 181626.

It is an arithmetic number, because the mean of its divisors is an integer number (109471824).

Almost surely, 2^1390785851 is an apocalyptic number.

1390785851 is a deficient number, since it is larger than the sum of its proper divisors (360763333).

1390785851 is a wasteful number, since it uses less digits than its factorization.

1390785851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355490.

The product of its (nonzero) digits is 302400, while the sum is 47.

The square root of 1390785851 is about 37293.2413581871. The cubic root of 1390785851 is about 1116.2293079651.

The spelling of 1390785851 in words is "one billion, three hundred ninety million, seven hundred eighty-five thousand, eight hundred fifty-one".