42989551 has 8 divisors (see below), whose sum is σ = 47988864. Its totient is φ = 38172120.

The previous prime is 42989489. The next prime is 42989587. The reversal of 42989551 is 15598924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42989551 - 2⁷ = 42989423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 42989498 and 42989507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42989251) 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, 44971 + ... + 45916.

It is an arithmetic number, because the mean of its divisors is an integer number (5998608).

Almost surely, 2^42989551 is an apocalyptic number.

42989551 is a deficient number, since it is larger than the sum of its proper divisors (4999313).

42989551 is a wasteful number, since it uses less digits than its factorization.

42989551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90941.

The product of its digits is 129600, while the sum is 43.

The square root of 42989551 is about 6556.6417471141. The cubic root of 42989551 is about 350.3114262155.

The spelling of 42989551 in words is "forty-two million, nine hundred eighty-nine thousand, five hundred fifty-one".