2155240542 has 32 divisors (see below), whose sum is σ = 5305208832. Its totient is φ = 568414944.

The previous prime is 2155240511. The next prime is 2155240543. The reversal of 2155240542 is 2450425512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155240543) 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, 1973118 + ... + 1974209.

It is an arithmetic number, because the mean of its divisors is an integer number (165787776).

Almost surely, 2^2155240542 is an apocalyptic number.

2155240542 is an abundant number, since it is smaller than the sum of its proper divisors (3149968290).

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

2155240542 is a wasteful number, since it uses less digits than its factorization.

2155240542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947352.

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 2155240542 is about 46424.5683017085. The cubic root of 2155240542 is about 1291.7106767957.

The spelling of 2155240542 in words is "two billion, one hundred fifty-five million, two hundred forty thousand, five hundred forty-two".