4000551 has 16 divisors (see below), whose sum is σ = 5720064. Its totient is φ = 2480544.

The previous prime is 4000543. The next prime is 4000553. The reversal of 4000551 is 1550004.

It is not a de Polignac number, because 4000551 - 2³ = 4000543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4000551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000553) 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, 1770 + ... + 3336.

It is an arithmetic number, because the mean of its divisors is an integer number (357504).

Almost surely, 2^4000551 is an apocalyptic number.

4000551 is a deficient number, since it is larger than the sum of its proper divisors (1719513).

4000551 is a wasteful number, since it uses less digits than its factorization.

4000551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 4000551 is about 2000.1377452566. The cubic root of 4000551 is about 158.7473936787.

Adding to 4000551 its reverse (1550004), we get a palindrome (5550555).

The spelling of 4000551 in words is "four million, five hundred fifty-one", and thus it is an aban number.