1220640454 has 16 divisors (see below), whose sum is σ = 2011786560. Its totient is φ = 550843560.

The previous prime is 1220640451. The next prime is 1220640467. The reversal of 1220640454 is 4540460221.

It is a super-2 number, since 2×1220640454² = 2979926235882652232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220640451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196524 + ... + 202639.

It is an arithmetic number, because the mean of its divisors is an integer number (125736660).

Almost surely, 2^1220640454 is an apocalyptic number.

1220640454 is a deficient number, since it is larger than the sum of its proper divisors (791146106).

1220640454 is a wasteful number, since it uses less digits than its factorization.

1220640454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399315.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 1220640454 is about 34937.6652625787. The cubic root of 1220640454 is about 1068.7166767126.

The spelling of 1220640454 in words is "one billion, two hundred twenty million, six hundred forty thousand, four hundred fifty-four".