1420757981 has 8 divisors (see below), whose sum is σ = 1443520320. Its totient is φ = 1398041568.

The previous prime is 1420757951. The next prime is 1420758007. The reversal of 1420757981 is 1897570241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1420757981 - 2²⁶ = 1353649117 is a prime.

It is a super-2 number, since 2×1420757981² = 4037106481150392722, 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 (1420757941) 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, 53825 + ... + 75753.

It is an arithmetic number, because the mean of its divisors is an integer number (180440040).

Almost surely, 2^1420757981 is an apocalyptic number.

It is an amenable number.

1420757981 is a deficient number, since it is larger than the sum of its proper divisors (22762339).

1420757981 is an equidigital number, since it uses as much as digits as its factorization.

1420757981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22963.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 1420757981 is about 37692.9433846708. The cubic root of 1420757981 is about 1124.1908205238.

The spelling of 1420757981 in words is "one billion, four hundred twenty million, seven hundred fifty-seven thousand, nine hundred eighty-one".