36399780 has 60 divisors (see below), whose sum is σ = 114192540. Its totient is φ = 9706176.

The previous prime is 36399767. The next prime is 36399793. The reversal of 36399780 is 8799363.

It is a happy number.

36399780 is a `hidden beast` number, since 3 + 639 + 9 + 7 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (36399767) and next prime (36399793).

It can be written as a sum of positive squares in 2 ways, for example, as 20575296 + 15824484 = 4536^2 + 3978^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9615 + ... + 12854.

It is an arithmetic number, because the mean of its divisors is an integer number (1903209).

Almost surely, 2^36399780 is an apocalyptic number.

36399780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

36399780 is an abundant number, since it is smaller than the sum of its proper divisors (77792760).

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

36399780 is a wasteful number, since it uses less digits than its factorization.

36399780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22490 (or 22479 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 36399780 is about 6033.2230192493. The cubic root of 36399780 is about 331.4104915892.

The spelling of 36399780 in words is "thirty-six million, three hundred ninety-nine thousand, seven hundred eighty".