39279645 has 24 divisors (see below), whose sum is σ = 68238456. Its totient is φ = 20901888.

The previous prime is 39279641. The next prime is 39279677. The reversal of 39279645 is 54697293.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12467961 + 26811684 = 3531^2 + 5178^2 .

It is not a de Polignac number, because 39279645 - 2² = 39279641 is a prime.

It is a super-2 number, since 2×39279645² = 3085781022652050, which contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39279645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39279641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29637 + ... + 30933.

It is an arithmetic number, because the mean of its divisors is an integer number (2843269).

Almost surely, 2^39279645 is an apocalyptic number.

It is an amenable number.

39279645 is a deficient number, since it is larger than the sum of its proper divisors (28958811).

39279645 is a wasteful number, since it uses less digits than its factorization.

39279645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981 (or 1978 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 39279645 is about 6267.3475250699. The cubic root of 39279645 is about 339.9297576923.

The spelling of 39279645 in words is "thirty-nine million, two hundred seventy-nine thousand, six hundred forty-five".