15222740 has 24 divisors (see below), whose sum is σ = 34427400. Its totient is φ = 5620608.

The previous prime is 15222719. The next prime is 15222761. The reversal of 15222740 is 4722251.

It is a happy number.

15222740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15222719) and next prime (15222761).

It can be written as a sum of positive squares in 4 ways, for example, as 75076 + 15147664 = 274^2 + 3892^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29015 + ... + 29534.

It is an arithmetic number, because the mean of its divisors is an integer number (1434475).

Almost surely, 2^15222740 is an apocalyptic number.

15222740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15222740 is an abundant number, since it is smaller than the sum of its proper divisors (19204660).

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

15222740 is a wasteful number, since it uses less digits than its factorization.

15222740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58571 (or 58569 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 15222740 is about 3901.6329914537. The cubic root of 15222740 is about 247.8359346701.

Adding to 15222740 its reverse (4722251), we get a palindrome (19944991).

The spelling of 15222740 in words is "fifteen million, two hundred twenty-two thousand, seven hundred forty".