13721402 has 4 divisors (see below), whose sum is σ = 20582106. Its totient is φ = 6860700.

The previous prime is 13721381. The next prime is 13721419. The reversal of 13721402 is 20412731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20412731 = 79 ⋅258389.

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 4363921 = 3059^2 + 2089^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3430349 + ... + 3430352.

Almost surely, 2^13721402 is an apocalyptic number.

13721402 is a deficient number, since it is larger than the sum of its proper divisors (6860704).

13721402 is an equidigital number, since it uses as much as digits as its factorization.

13721402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6860703.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 13721402 is about 3704.2410828670. The cubic root of 13721402 is about 239.4047866321.

The spelling of 13721402 in words is "thirteen million, seven hundred twenty-one thousand, four hundred two".