43401521 has 8 divisors (see below), whose sum is σ = 44417760. Its totient is φ = 42394752.

The previous prime is 43401517. The next prime is 43401557. The reversal of 43401521 is 12510434.

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 43401521 - 2² = 43401517 is a prime.

It is a super-2 number, since 2×43401521² = 3767384050226882, 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 = 43401493 and 43401502.

It is not an unprimeable number, because it can be changed into a prime (43401571) 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, 7361 + ... + 11873.

It is an arithmetic number, because the mean of its divisors is an integer number (5552220).

Almost surely, 2^43401521 is an apocalyptic number.

It is an amenable number.

43401521 is a deficient number, since it is larger than the sum of its proper divisors (1016239).

43401521 is a wasteful number, since it uses less digits than its factorization.

43401521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 43401521 is about 6587.9830752667. The cubic root of 43401521 is about 351.4268851525.

Adding to 43401521 its reverse (12510434), we get a palindrome (55911955).

It can be divided in two parts, 434015 and 21, that multiplied together give a triangular number (9114315 = T₄₂₆₉).

The spelling of 43401521 in words is "forty-three million, four hundred one thousand, five hundred twenty-one".