1421506640 has 40 divisors (see below), whose sum is σ = 3367371528. Its totient is φ = 557872640.

The previous prime is 1421506633. The next prime is 1421506687. The reversal of 1421506640 is 466051241.

It can be written as a sum of positive squares in 4 ways, for example, as 339886096 + 1081620544 = 18436^2 + 32888^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1421506640² = 4041362255128179200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163391 + ... + 171870.

Almost surely, 2^1421506640 is an apocalyptic number.

1421506640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421506640 is an abundant number, since it is smaller than the sum of its proper divisors (1945864888).

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

1421506640 is a wasteful number, since it uses less digits than its factorization.

1421506640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335327 (or 335321 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1421506640 is about 37702.8731000702. The cubic root of 1421506640 is about 1124.3882474838.

Adding to 1421506640 its reverse (466051241), we get a palindrome (1887557881).

The spelling of 1421506640 in words is "one billion, four hundred twenty-one million, five hundred six thousand, six hundred forty".