13721401 has 8 divisors (see below), whose sum is σ = 14681600. Its totient is φ = 12785040.

The previous prime is 13721381. The next prime is 13721419. The reversal of 13721401 is 10412731.

13721401 = T₃₀₂₃ + T₃₀₂₄ + T₃₀₂₅.

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 13721401 - 2⁵ = 13721369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13721441) 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, 4761 + ... + 7078.

It is an arithmetic number, because the mean of its divisors is an integer number (1835200).

Almost surely, 2^13721401 is an apocalyptic number.

13721401 is the 3025-th centered triangular number.

It is an amenable number.

13721401 is a deficient number, since it is larger than the sum of its proper divisors (960199).

13721401 is a wasteful number, since it uses less digits than its factorization.

13721401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11919.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 13721401 is about 3704.2409478866. The cubic root of 13721401 is about 239.4047808162.

The spelling of 13721401 in words is "thirteen million, seven hundred twenty-one thousand, four hundred one".