427892981 has 4 divisors (see below), whose sum is σ = 430618572. Its totient is φ = 425167392.

The previous prime is 427892963. The next prime is 427893001. The reversal of 427892981 is 189298724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221712100 + 206180881 = 14890^2 + 14359^2 .

It is a cyclic number.

It is not a de Polignac number, because 427892981 - 2⁶ = 427892917 is a prime.

It is a super-2 number, since 2×427892981² = 366184806378132722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427892951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1362560 + ... + 1362873.

It is an arithmetic number, because the mean of its divisors is an integer number (107654643).

Almost surely, 2^427892981 is an apocalyptic number.

It is an amenable number.

427892981 is a deficient number, since it is larger than the sum of its proper divisors (2725591).

427892981 is a wasteful number, since it uses less digits than its factorization.

427892981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725590.

The product of its digits is 580608, while the sum is 50.

The square root of 427892981 is about 20685.5742245653. The cubic root of 427892981 is about 753.5493869346.

The spelling of 427892981 in words is "four hundred twenty-seven million, eight hundred ninety-two thousand, nine hundred eighty-one".