34400021 has 8 divisors (see below), whose sum is σ = 35178624. Its totient is φ = 33626320.

The previous prime is 34400017. The next prime is 34400029. The reversal of 34400021 is 12000443.

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 34400021 - 2² = 34400017 is a prime.

It is a super-2 number, since 2×34400021² = 2366722889600882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 34399969 and 34400005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34400029) 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, 15440 + ... + 17526.

It is an arithmetic number, because the mean of its divisors is an integer number (4397328).

Almost surely, 2^34400021 is an apocalyptic number.

It is an amenable number.

34400021 is a deficient number, since it is larger than the sum of its proper divisors (778603).

34400021 is a wasteful number, since it uses less digits than its factorization.

34400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 34400021 is about 5865.1531096809. The cubic root of 34400021 is about 325.2267325157.

Adding to 34400021 its reverse (12000443), we get a palindrome (46400464).

The spelling of 34400021 in words is "thirty-four million, four hundred thousand, twenty-one".