405661245 has 16 divisors (see below), whose sum is σ = 708063552. Its totient is φ = 196684160.

The previous prime is 405661211. The next prime is 405661253. The reversal of 405661245 is 542166504.

It is not a de Polignac number, because 405661245 - 2⁶ = 405661181 is a prime.

It is a super-2 number, since 2×405661245² = 329122091389900050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1229112 + ... + 1229441.

It is an arithmetic number, because the mean of its divisors is an integer number (44253972).

Almost surely, 2^405661245 is an apocalyptic number.

It is an amenable number.

405661245 is a deficient number, since it is larger than the sum of its proper divisors (302402307).

405661245 is a wasteful number, since it uses less digits than its factorization.

405661245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458572.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 405661245 is about 20141.0338612495. The cubic root of 405661245 is about 740.2660627153.

The spelling of 405661245 in words is "four hundred five million, six hundred sixty-one thousand, two hundred forty-five".