120138945 has 16 divisors (see below), whose sum is σ = 192360192. Its totient is φ = 64028160.

The previous prime is 120138943. The next prime is 120139007. The reversal of 120138945 is 549831021.

It is not a de Polignac number, because 120138945 - 2¹ = 120138943 is a prime.

It is a super-2 number, since 2×120138945² = 28866732211426050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (120138943) 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, 34065 + ... + 37425.

It is an arithmetic number, because the mean of its divisors is an integer number (12022512).

Almost surely, 2^120138945 is an apocalyptic number.

120138945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120138945 is a deficient number, since it is larger than the sum of its proper divisors (72221247).

120138945 is a wasteful number, since it uses less digits than its factorization.

120138945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 120138945 is about 10960.7912579339. The cubic root of 120138945 is about 493.4327124584.

Adding to 120138945 its reverse (549831021), we get a palindrome (669969966).

The spelling of 120138945 in words is "one hundred twenty million, one hundred thirty-eight thousand, nine hundred forty-five".