1954857640 has 32 divisors (see below), whose sum is σ = 4399764480. Its totient is φ = 781705792.

The previous prime is 1954857637. The next prime is 1954857647. The reversal of 1954857640 is 467584591.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1954857647) 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, 192777 + ... + 202663.

It is an arithmetic number, because the mean of its divisors is an integer number (137492640).

Almost surely, 2^1954857640 is an apocalyptic number.

1954857640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1954857640 is an abundant number, since it is smaller than the sum of its proper divisors (2444906840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1954857640 is a wasteful number, since it uses less digits than its factorization.

1954857640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14841 (or 14837 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The square root of 1954857640 is about 44213.7720625599. The cubic root of 1954857640 is about 1250.3695206195.

The spelling of 1954857640 in words is "one billion, nine hundred fifty-four million, eight hundred fifty-seven thousand, six hundred forty".