13699620 has 216 divisors, whose sum is σ = 49670712. Its totient is φ = 3041280.

The previous prime is 13699619. The next prime is 13699639. The reversal of 13699620 is 2699631.

13699620 = T₁₄₄ + T₁₄₅ + ... + T₄₃₉.

It can be written as a sum of positive squares in 4 ways, for example, as 5645376 + 8054244 = 2376^2 + 2838^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 370242 + ... + 370278.

It is an arithmetic number, because the mean of its divisors is an integer number (229957).

Almost surely, 2^13699620 is an apocalyptic number.

13699620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13699620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24835356).

13699620 is an abundant number, since it is smaller than the sum of its proper divisors (35971092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13699620 is a wasteful number, since it uses less digits than its factorization.

13699620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 13699620 is about 3701.2997717018. The cubic root of 13699620 is about 239.2780387274.

The spelling of 13699620 in words is "thirteen million, six hundred ninety-nine thousand, six hundred twenty".