15977340 has 72 divisors (see below), whose sum is σ = 49795200. Its totient is φ = 4143744.

The previous prime is 15977333. The next prime is 15977359. The reversal of 15977340 is 4377951.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 15977295 and 15977304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5461 + ... + 7859.

It is an arithmetic number, because the mean of its divisors is an integer number (691600).

Almost surely, 2^15977340 is an apocalyptic number.

15977340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15977340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24897600).

15977340 is an abundant number, since it is smaller than the sum of its proper divisors (33817860).

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

15977340 is a wasteful number, since it uses less digits than its factorization.

15977340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2446 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 15977340 is about 3997.1664964072. The cubic root of 15977340 is about 251.8651962311.

The spelling of 15977340 in words is "fifteen million, nine hundred seventy-seven thousand, three hundred forty".