13888890 has 24 divisors (see below), whose sum is σ = 36111348. Its totient is φ = 3703680.

The previous prime is 13888879. The next prime is 13888933. The reversal of 13888890 is 9888831.

It can be written as a sum of positive squares in 2 ways, for example, as 12383361 + 1505529 = 3519^2 + 1227^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77071 + ... + 77250.

Almost surely, 2^13888890 is an apocalyptic number.

13888890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13888890 is an abundant number, since it is smaller than the sum of its proper divisors (22222458).

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

13888890 is a wasteful number, since it uses less digits than its factorization.

13888890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154334 (or 154331 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 13888890 is about 3726.7801115708. The cubic root of 13888890 is about 240.3749347946.

The spelling of 13888890 in words is "thirteen million, eight hundred eighty-eight thousand, eight hundred ninety".