155840406 has 16 divisors (see below), whose sum is σ = 313924800. Its totient is φ = 51572808.

The previous prime is 155840389. The next prime is 155840407. The reversal of 155840406 is 604048551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155840407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92596 + ... + 94263.

It is an arithmetic number, because the mean of its divisors is an integer number (19620300).

Almost surely, 2^155840406 is an apocalyptic number.

155840406 is an abundant number, since it is smaller than the sum of its proper divisors (158084394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155840406 is a wasteful number, since it uses less digits than its factorization.

155840406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187003.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 155840406 is about 12483.6054888001. The cubic root of 155840406 is about 538.1376241203.

Adding to 155840406 its reverse (604048551), we get a palindrome (759888957).

The spelling of 155840406 in words is "one hundred fifty-five million, eight hundred forty thousand, four hundred six".