1200139545 has 32 divisors (see below), whose sum is σ = 2100602880. Its totient is φ = 580271040.

The previous prime is 1200139543. The next prime is 1200139547. The reversal of 1200139545 is 5459310021.

It is an interprime number because it is at equal distance from previous prime (1200139543) and next prime (1200139547).

It is not a de Polignac number, because 1200139545 - 2¹ = 1200139543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200139543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50646 + ... + 70464.

It is an arithmetic number, because the mean of its divisors is an integer number (65643840).

Almost surely, 2^1200139545 is an apocalyptic number.

1200139545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200139545 is a deficient number, since it is larger than the sum of its proper divisors (900463335).

1200139545 is a wasteful number, since it uses less digits than its factorization.

1200139545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20205.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1200139545 is about 34643.0302514084. The cubic root of 1200139545 is about 1062.6997588888.

Adding to 1200139545 its reverse (5459310021), we get a palindrome (6659449566).

The spelling of 1200139545 in words is "one billion, two hundred million, one hundred thirty-nine thousand, five hundred forty-five".