1429640 has 32 divisors (see below), whose sum is σ = 3257280. Its totient is φ = 564672.

The previous prime is 1429633. The next prime is 1429651. The reversal of 1429640 is 469241.

1429640 = 63² + 64² + ... + 165².

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, 3947 + ... + 4293.

It is an arithmetic number, because the mean of its divisors is an integer number (101790).

2^1429640 is an apocalyptic number.

1429640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1429640 is an abundant number, since it is smaller than the sum of its proper divisors (1827640).

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

1429640 is a wasteful number, since it uses less digits than its factorization.

1429640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1429640 is about 1195.6755412736. The cubic root of 1429640 is about 112.6528621595.

The spelling of 1429640 in words is "one million, four hundred twenty-nine thousand, six hundred forty".