155120407 has 8 divisors (see below), whose sum is σ = 168586880. Its totient is φ = 141873120.

The previous prime is 155120387. The next prime is 155120419. The reversal of 155120407 is 704021551.

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 155120407 - 2¹⁹ = 154596119 is a prime.

It is a super-3 number, since 3×155120407³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155120447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53319 + ... + 56152.

It is an arithmetic number, because the mean of its divisors is an integer number (21073360).

Almost surely, 2^155120407 is an apocalyptic number.

155120407 is a deficient number, since it is larger than the sum of its proper divisors (13466473).

155120407 is a wasteful number, since it uses less digits than its factorization.

155120407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109593.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 155120407 is about 12454.7343207312. The cubic root of 155120407 is about 537.3075937980.

Adding to 155120407 its reverse (704021551), we get a palindrome (859141958).

The spelling of 155120407 in words is "one hundred fifty-five million, one hundred twenty thousand, four hundred seven".