47979405 has 32 divisors (see below), whose sum is σ = 85979520. Its totient is φ = 25384320.

The previous prime is 47979377. The next prime is 47979409. The reversal of 47979405 is 50497974.

It is not a de Polignac number, because 47979405 - 2¹³ = 47971213 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47979409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16329 + ... + 19041.

It is an arithmetic number, because the mean of its divisors is an integer number (2686860).

Almost surely, 2^47979405 is an apocalyptic number.

47979405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

47979405 is a deficient number, since it is larger than the sum of its proper divisors (38000115).

47979405 is a wasteful number, since it uses less digits than its factorization.

47979405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858 (or 2852 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 47979405 is about 6926.7167547114. The cubic root of 47979405 is about 363.3721339105.

Subtracting 47979405 from its reverse (50497974), we obtain a square (2518569 = 1587²).

It can be divided in two parts, 47979 and 405, that added together give a palindrome (48384).

The spelling of 47979405 in words is "forty-seven million, nine hundred seventy-nine thousand, four hundred five".