15218940 has 48 divisors (see below), whose sum is σ = 46488960. Its totient is φ = 3689280.

The previous prime is 15218933. The next prime is 15218941. The reversal of 15218940 is 4981251.

It is a happy number.

It is a super-2 number, since 2×15218940² = 463232269447200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15218898 and 15218907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15218941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10870 + ... + 12189.

It is an arithmetic number, because the mean of its divisors is an integer number (968520).

Almost surely, 2^15218940 is an apocalyptic number.

15218940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15218940 is an abundant number, since it is smaller than the sum of its proper divisors (31270020).

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

15218940 is a wasteful number, since it uses less digits than its factorization.

15218940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23082 (or 23080 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 15218940 is about 3901.1459854766. The cubic root of 15218940 is about 247.8153108112.

The spelling of 15218940 in words is "fifteen million, two hundred eighteen thousand, nine hundred forty".