1390571945 has 8 divisors (see below), whose sum is σ = 1907070144. Its totient is φ = 953535024.

The previous prime is 1390571909. The next prime is 1390571947. The reversal of 1390571945 is 5491750931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1390571945 - 2¹⁰ = 1390570921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390571896 and 1390571905.

It is not an unprimeable number, because it can be changed into a prime (1390571947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19865279 + ... + 19865348.

It is an arithmetic number, because the mean of its divisors is an integer number (238383768).

Almost surely, 2^1390571945 is an apocalyptic number.

It is an amenable number.

1390571945 is a deficient number, since it is larger than the sum of its proper divisors (516498199).

1390571945 is an equidigital number, since it uses as much as digits as its factorization.

1390571945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39730639.

The product of its (nonzero) digits is 170100, while the sum is 44.

The square root of 1390571945 is about 37290.3733555994. The cubic root of 1390571945 is about 1116.1720788361.

The spelling of 1390571945 in words is "one billion, three hundred ninety million, five hundred seventy-one thousand, nine hundred forty-five".