2154634140 has 24 divisors (see below), whose sum is σ = 6032975760. Its totient is φ = 574569088.

The previous prime is 2154634123. The next prime is 2154634147. The reversal of 2154634140 is 414364512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2154634098 and 2154634107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154634147) 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, 17955225 + ... + 17955344.

It is an arithmetic number, because the mean of its divisors is an integer number (251373990).

Almost surely, 2^2154634140 is an apocalyptic number.

2154634140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154634140 is an abundant number, since it is smaller than the sum of its proper divisors (3878341620).

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

2154634140 is a wasteful number, since it uses less digits than its factorization.

2154634140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35910581 (or 35910579 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2154634140 is about 46418.0367960559. The cubic root of 2154634140 is about 1291.5895194899.

Adding to 2154634140 its reverse (414364512), we get a palindrome (2568998652).

The spelling of 2154634140 in words is "two billion, one hundred fifty-four million, six hundred thirty-four thousand, one hundred forty".