42999621 has 16 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 24259248.

The previous prime is 42999601. The next prime is 42999623. The reversal of 42999621 is 12699924.

It is not a de Polignac number, because 42999621 - 2⁶ = 42999557 is a prime.

It is a super-2 number, since 2×42999621² = 3697934812287282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42999623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11301 + ... + 14618.

It is an arithmetic number, because the mean of its divisors is an integer number (4147200).

Almost surely, 2^42999621 is an apocalyptic number.

It is an amenable number.

42999621 is a deficient number, since it is larger than the sum of its proper divisors (23355579).

42999621 is a wasteful number, since it uses less digits than its factorization.

42999621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26008.

The product of its digits is 69984, while the sum is 42.

The square root of 42999621 is about 6557.4096257592. The cubic root of 42999621 is about 350.3387767427.

The spelling of 42999621 in words is "forty-two million, nine hundred ninety-nine thousand, six hundred twenty-one".