405149745 has 128 divisors (see below), whose sum is σ = 881491968. Its totient is φ = 154725120.

The previous prime is 405149713. The next prime is 405149747. The reversal of 405149745 is 547941504.

It is not a de Polignac number, because 405149745 - 2⁵ = 405149713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (405149747) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1816704 + ... + 1816926.

It is an arithmetic number, because the mean of its divisors is an integer number (6886656).

Almost surely, 2^405149745 is an apocalyptic number.

It is an amenable number.

405149745 is an abundant number, since it is smaller than the sum of its proper divisors (476342223).

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

405149745 is a wasteful number, since it uses less digits than its factorization.

405149745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 405149745 is about 20128.3318980983. The cubic root of 405149745 is about 739.9547969710.

The spelling of 405149745 in words is "four hundred five million, one hundred forty-nine thousand, seven hundred forty-five".