15428969 has 4 divisors (see below), whose sum is σ = 16241040. Its totient is φ = 14616900.

The previous prime is 15428947. The next prime is 15428971. The reversal of 15428969 is 96982451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96982451 = 199 ⋅487349.

It is a cyclic number.

It is not a de Polignac number, because 15428969 - 2⁸ = 15428713 is a prime.

It is a super-2 number, since 2×15428969² = 476106168805922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15428909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406007 + ... + 406044.

It is an arithmetic number, because the mean of its divisors is an integer number (4060260).

Almost surely, 2^15428969 is an apocalyptic number.

15428969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15428969 is a deficient number, since it is larger than the sum of its proper divisors (812071).

15428969 is an equidigital number, since it uses as much as digits as its factorization.

15428969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812070.

The product of its digits is 155520, while the sum is 44.

The square root of 15428969 is about 3927.9726322876. The cubic root of 15428969 is about 248.9500983315.

The spelling of 15428969 in words is "fifteen million, four hundred twenty-eight thousand, nine hundred sixty-nine".