155397765 has 16 divisors (see below), whose sum is σ = 263262528. Its totient is φ = 78003456.

The previous prime is 155397757. The next prime is 155397793. The reversal of 155397765 is 567793551.

It is not a de Polignac number, because 155397765 - 2³ = 155397757 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304447 + ... + 304956.

It is an arithmetic number, because the mean of its divisors is an integer number (16453908).

Almost surely, 2^155397765 is an apocalyptic number.

155397765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155397765 is a deficient number, since it is larger than the sum of its proper divisors (107864763).

155397765 is a wasteful number, since it uses less digits than its factorization.

155397765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609428.

The product of its digits is 992250, while the sum is 48.

The square root of 155397765 is about 12465.8639893110. The cubic root of 155397765 is about 537.6276415809.

The spelling of 155397765 in words is "one hundred fifty-five million, three hundred ninety-seven thousand, seven hundred sixty-five".