1390542505 has 16 divisors (see below), whose sum is σ = 1823099904. Its totient is φ = 1009774080.

The previous prime is 1390542499. The next prime is 1390542509. The reversal of 1390542505 is 5052450931.

1390542505 = T₁₅₈₉₅ + T₁₅₈₉₆ + ... + T₁₅₉₀₅.

It is not a de Polignac number, because 1390542505 - 2⁹ = 1390541993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390542509) 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, 18232 + ... + 55798.

It is an arithmetic number, because the mean of its divisors is an integer number (113943744).

Almost surely, 2^1390542505 is an apocalyptic number.

It is an amenable number.

1390542505 is a deficient number, since it is larger than the sum of its proper divisors (432557399).

1390542505 is a wasteful number, since it uses less digits than its factorization.

1390542505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38256.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 1390542505 is about 37289.9786135632. The cubic root of 1390542505 is about 1116.1642019003.

The spelling of 1390542505 in words is "one billion, three hundred ninety million, five hundred forty-two thousand, five hundred five".