15550397 has 8 divisors (see below), whose sum is σ = 16022016. Its totient is φ = 15081552.

The previous prime is 15550331. The next prime is 15550421. The reversal of 15550397 is 79305551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15550397 - 2⁸ = 15550141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17588 + ... + 18450.

It is an arithmetic number, because the mean of its divisors is an integer number (2002752).

Almost surely, 2^15550397 is an apocalyptic number.

It is an amenable number.

15550397 is a deficient number, since it is larger than the sum of its proper divisors (471619).

15550397 is an equidigital number, since it uses as much as digits as its factorization.

15550397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387.

The product of its (nonzero) digits is 23625, while the sum is 35.

The square root of 15550397 is about 3943.3991682304. The cubic root of 15550397 is about 249.6014824058.

The spelling of 15550397 in words is "fifteen million, five hundred fifty thousand, three hundred ninety-seven".