427901691 has 16 divisors (see below), whose sum is σ = 660975104. Its totient is φ = 241164864.

The previous prime is 427901687. The next prime is 427901723. The reversal of 427901691 is 196109724.

It is not a de Polignac number, because 427901691 - 2² = 427901687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427901671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138031 + ... + 141096.

It is an arithmetic number, because the mean of its divisors is an integer number (41310944).

Almost surely, 2^427901691 is an apocalyptic number.

427901691 is a deficient number, since it is larger than the sum of its proper divisors (233073413).

427901691 is a wasteful number, since it uses less digits than its factorization.

427901691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279210.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 427901691 is about 20685.7847566874. The cubic root of 427901691 is about 753.5544998724.

The spelling of 427901691 in words is "four hundred twenty-seven million, nine hundred one thousand, six hundred ninety-one".